diff --git a/fuzzers/007-timing/Makefile b/fuzzers/007-timing/Makefile
index 1f90909f..40e42a35 100644
--- a/fuzzers/007-timing/Makefile
+++ b/fuzzers/007-timing/Makefile
@@ -1,5 +1,26 @@
-all:
-	cd speed && make
-	cd timgrid && make
-	cd projects && make
+# for now hammering on just picorv32
+# consider instead aggregating multiple projects
+PRJ?=picorv32
+PRJN?=8
+
+all: build/tilea.json
+
+clean:
+	rm -rf build
+	cd speed && $(MAKE) clean
+	cd timgrid && $(MAKE) clean
+	cd projects && $(MAKE) clean
+
+speed/build/speed.json:
+	cd speed && $(MAKE)
+
+timgrid/build/timgrid.json:
+	cd timgrid && $(MAKE)
+
+build/tilea.json: projects/$(PRJ)/build/tilea.json
+	mkdir -p build
+	cp projects/$(PRJ)/build/tilea.json build/tilea.json
+
+projects/$(PRJ)/build/tilea.json: speed/build/speed.json timgrid/build/timgrid.json
+	cd projects/$(PRJ) && $(MAKE) N=$(PRJN)
 
diff --git a/fuzzers/007-timing/README.md b/fuzzers/007-timing/README.md
index 047e073c..a7c79eb2 100644
--- a/fuzzers/007-timing/README.md
+++ b/fuzzers/007-timing/README.md
@@ -13,19 +13,11 @@ Currently this document focuses exclusively on fabric timing delays.
 ## Quick start
 
 ```
-pushd speed
 make
-popd
-
-pushd timgrid
-make
-popd
-
-pushd projects/placelut
-make N=1
-popd
 ```
 
+This will take a relatively long time (say 45 min) and generate build/tilea.json
+
 
 ## Vivado background
 
diff --git a/fuzzers/007-timing/projects/project.mk b/fuzzers/007-timing/projects/project.mk
index 691bb048..7e2b4f1f 100644
--- a/fuzzers/007-timing/projects/project.mk
+++ b/fuzzers/007-timing/projects/project.mk
@@ -12,7 +12,7 @@ BADPRJ_OK?=N
 
 TILEA_JSONS=build/fast_max/tilea.json build/fast_min/tilea.json build/slow_max/tilea.json build/slow_min/tilea.json
 
-all: $(TILEA_JSONS)
+all: build/tilea.json
 
 # make build/checksub first
 build/fast_max/tilea.json: build/checksub
@@ -76,3 +76,6 @@ build/checksub: build/grouped.csv build/sub.json
 	python3 $(TIMFUZ_DIR)/checksub.py --sub-json build/sub.json build/grouped.csv
 	touch build/checksub
 
+build/tilea.json: $(TILEA_JSONS)
+	python3 $(TIMFUZ_DIR)/tile_combine.py --out build/tilea.json $(TILEA_JSONS)
+
diff --git a/fuzzers/007-timing/tile_combine.py b/fuzzers/007-timing/tile_combine.py
new file mode 100644
index 00000000..35ea2291
--- /dev/null
+++ b/fuzzers/007-timing/tile_combine.py
@@ -0,0 +1,123 @@
+#!/usr/bin/env python3
+
+import sys
+import os
+import time
+import json
+from collections import OrderedDict
+
+corner_s2i = OrderedDict([
+    ('fast_max', 0),
+    ('fast_min', 1),
+    ('slow_max', 2),
+    ('slow_min', 3),
+    ])
+
+corner2minmax = {
+    'fast_max': max,
+    'fast_min': min,
+    'slow_max': max,
+    'slow_min': min,
+    }
+
+def build_tilejo(fnins):
+    '''
+    {
+        "tiles": {
+            "BRKH_B_TERM_INT": {
+                "pips": {},
+                "wires": {
+                    "B_TERM_UTURN_INT_ER1BEG0": [
+                        null,
+                        null,
+                        93,
+                        null
+                    ],
+    '''
+
+    tilejo = {"tiles": {}}
+    for fnin in fnins:
+        tileji = json.load(open(fnin, 'r'))
+        for tilek, tilevi in tileji['tiles'].items():
+            # No previous data? Copy
+            tilevo = tilejo['tiles'].get(tilek, None)
+            if tilevo is None:
+                tilejo['tiles'][tilek] = tilevi
+            # Otherwise combine
+            else:
+                def process_type(etype):
+                    for pipk, pipvi in tilevi[etype].items():
+                        pipvo = tilevo[etype][pipk]
+                        for cornerk, corneri in corner_s2i.items():
+                            cornervo = pipvo[corneri]
+                            cornervi = pipvi[corneri]
+                            # no new data
+                            if cornervi is None:
+                                pass
+                            # no previous data
+                            elif cornervo is None:
+                                pipvo[corneri] = cornervi
+                            # combine
+                            else:
+                                minmax = corner2minmax[cornerk]
+                                pipvo[corneri] = minmax(cornervi, cornervo)
+                process_type('pips')
+                process_type('wires')
+    return tilejo
+
+def check_corner_minmax(tilej, verbose=False):
+    # Post processing pass looking for min/max inconsistencies
+    # Especially an issue due to complexities around under-constrained elements
+    # (ex: pivots set to 0 delay)
+    print('Checking for min/max consistency')
+    checks = 0
+    bad = 0
+    for tilev in tilej['tiles'].values():
+        def process_type(etype):
+            nonlocal checks
+            nonlocal bad
+
+            for pipk, pipv in tilev[etype].items():
+                for corner in ('slow', 'fast'): 
+                    mini = corner_s2i[corner + '_min']
+                    minv = pipv[mini]
+                    maxi = corner_s2i[corner + '_max']
+                    maxv = pipv[maxi]
+                    if minv is not None and maxv is not None:
+                        checks += 1
+                        if minv > maxv:
+                            if verbose:
+                                print('WARNING: element %s %s min/max adjusted on corner %s' % (etype, pipk, corner))
+                            bad += 1
+                            pipv[mini] = maxv
+                            pipv[maxi] = minv
+
+        process_type('pips')
+        process_type('wires')
+    print('minmax: %u / %u bad' % (bad, checks))
+
+def check_corners_minmax(tilej, verbose=False):
+    # TODO: check fast vs slow
+    pass
+
+def run(fnins, fnout, verbose=False):
+    tilejo = build_tilejo(fnins)
+    check_corner_minmax(tilejo)
+    check_corners_minmax(tilejo)
+    json.dump(tilejo, open(fnout, 'w'), sort_keys=True, indent=4, separators=(',', ': '))
+
+def main():
+    import argparse
+
+    parser = argparse.ArgumentParser(
+        description=
+        'Combine multiple tile corners into one .json file'
+    )
+    parser.add_argument('--out', required=True, help='Combined .json file')
+    parser.add_argument('fnins', nargs='+', help='Input .json files')
+    args = parser.parse_args()
+
+    run(args.fnins, args.out, verbose=False)
+
+if __name__ == '__main__':
+    main()