Realforce boards don't use a sheet, they use strings of domes ranging from 1u to 4u long. Depending on how vesper reassembled the board, he may have had to cutout a dome or two but there shouldn't have been a ton of modding required.
Some use a sheet actually, some don't. Not really sure why there's inconsistency but I've taken apart five boards now and the 106UW-KW and 104UW used a sheet for everything except the large keys/bottom row, the 104UB-DK had a split sheet for alphanum, then strings everywhere else, and I forgot what the 45g/55g 87Us were but I think one was a sheet with singles for large keys/bottom row, and the other was mostly strings.
edit - looks like i need to re-enable the post warning now that clackvent is over