Sorry to bring up a long semi abandoned thread, but I did actually get in touch with Holger Zimmerman, one of the original designers of the PAK boards, IIRC.
He was able to hook me up with some great advice, and was actually able to make the TOS ROM chip files, modified v3.06 for use with the PAK board.
There is still a lot of info and files at:
http://www.wrsonline.de/pak3.htmlYou'll have to run it through google translate of course, but it is there.
Anyway, I was able to get my PAK 68/3 board working and have it installed in an Atari STacy. Very tight fit, and not enough room for the add on boards like the FRAK (RAM) and PuPLa/2 (buffer), but it still rocks. According to the benchmark tests, its 987 percent faster than a stock ST.
Here is a picture of the STacy with the PAK board installed, and the top half of the STacy removed:
(Never mind, it won't let me attach a picture for some reason)
I know this is an Amiga site, but some people here did try to help me so I just wanted to let them know it wasn't in vain. Amazing what can still be done with these retro machines, isn't it?
Thanks everyone.