[Dominik]

I don't know the last millimeter of room under the SPF, but you may be able to slide the transmission back once the driveshaft is out. That helps if you don't have a second set of hands or transmission jack to assist you.

in the 90s Tilton had huge problems with the hydraulic throwout bearing mounted inside the bellhousing. What a pain it was... Should long be solved and any internal hydraulic throwout bearing should be working.

If you get a kit with slave cylinder to mount it outside, and have eough space, you can do that. Making the slave cylinder bracket yourself can be quite a lenthy exercise.