Porting of Famicom Detective Club 1 and 2 from FDS to NES.
Afterwards the rom can be extended to translate the game.
Same with Shin Onigashima.
FDS games have roughly 64KB of storage on each side - although in practice it's less, according to NESDev.com. Famicom Detective Club 1 has two double-sided disks for a total potential size of 256KB. By using the formula from NESDev.com and looking at the amount of space used on each side, I estimate around 34,833 bytes free across the four sides, which when combined with a simple DTE routine, should arguably be enough free space for a translation.
Converting FDS games to ROMs is no mean feat, and when you consider that practically every emulator and Everdrives all emulate the FDS perfectly well, it seems reasonable to leave the games as FDS games. Switching the game over to a cart mapper rather than just adding more stuff to the files on the disk seems like more trouble than is worth.
All this is just a long-winded way of saying that if someone really wants to translate FDC then go right ahead, but I'd personally much rather do it on FDS than a ROM.
Same situation for Shin Onigashima (it actually has even more free space on the disk) but you have the bigger problem of the text format going vertically rather than horizontally. Good luck fixing that!