Just thought I'd put this question out there to start a conversation, it's not something I plan on doing and I wouldn't have the money even if I wanted to!
I've been educating myself on all the after market transaxles out there and was amazed how many options there are. I started looking into Albins which is an Australian company, specifically the st6 transaxle which they developed for the V8 supercars and could be conceivably be used in an SW20 if you had the cash to spare?
Imagine a lightweight transaxle with high power handling and sequential shifting! And there are many companies offering large range of options. Admittedly the cost makes it impractical but its an interesting idea.
Any one with more knowledge in this area care to share their dream setup if they had a blank check to work with??