cabinet and backbox would be the same size, backglass Should also be the same size, as would the pf. You'd need to get a 2nd hand Kiss pf with all the wiring, boards would also be the same, obviously you would need a set of KISS ROMs for the mpu.

I considered doing the same thing at one point (building my own KISS pin from an old bally of the same vintage) until i managed to find the Kiss im currently restoring. Would be a fairly big task but definitely not impossible.

will be interesting to read what others think!