Yep, thats version 4 allright. If you need version 7 contact amigaATnishtekDOTcom.
Oh thats up to you, if you can get rom 1.3 & 2630 rom 4 to work thats great. Workbench and kickrom 1.3 is so ancient though. By the way, you can upgrade roms to version 7 on 2630 and still continue to use kickrom 1.3.
However, having said that, I have a working Amix but on rom 3.1 & rom 7.0 on both 2091 and 2630 board.
You also got a pm about that.