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grumpysnapper: I like your development model. If you have a few minutes, I'd be interested in your experience running the Harrop on the stock mechanicals. Specifically, I'm interested in the possibility of running something like that on a BRZ that serves as a light GT car. Engine longevity and drivability over multiple 4000 mile road trips and that sort of thing. No off pavement except for the occasional gravel parking lot. My first order of business is the suspension. I'd like to keep the stock ride height, or even add a couple of fractions to the wheel travel, and keep the basic character of the car. I'm waiting for 949 to birth the Xida coilover baby so I can give them a close look.
Not willing/able (at this point) to go with a built motor. That might torpedo the project, but it's worth a look/chat. And, hell, I'm not laying awake at night now pining for more ponies.