Transmission choices

I've been working on the design of this RX7 Turbo II to 4AG transmission adapter for quite some time.  But as it sits I'm only 50% done.  As much as i'd like to run this setup, wanna be like Taka A. and Toshiki Y., it may also not be cost effective for me.  Now I'm contemplating other avenues that may be more cost effective than this one. 

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