Well here's my fiesty lil Filly, straddling her double-shot donors...
The space bar from the 8200 fits perfectly with the extra piece glued in... before the glue set I fitted it to the board to get the position just right. If I hadn't, any slight error in the rotation of the new piece would've made space either wonky or sticky: 1 degree out would be 1mm out at the end of the bar. Then I left it upside down to fully set, just in case the glue was still mobile enough to slither downwards!
Delete/End/PgDn... I don't have correct height keys for them
The ones off the 7000 are too tall, and they're annoying in use, so I ended up using the low profile ones off the 11900. Looks worse, but feels better. (They were the only keys off the 11900, which had already been raped by a raptor... but that's another story for another thread...).
Cast, in order of appearance (prettiest first, by a long shot):
Filco Majestouch Tenkeyless 87MC/EB
Cherry G80-11900HRMGB/01 (Del, End, PgDn)
Cherry G80-8200HPDUS-2 (all keys from the main block except Enter and '\')
Cherry G81-7000HUAUS-2/02 (Cursors, Esc, F-keys, Ins, Home, PgUp, PrtSc, Scroll, Pause, Enter, '\')