Firstly welcome to the forum.
As for using a hedgeabuser engine, I don't think anyone on here is, but there is a blade engined roadster knocking about (the name of the owner escapes me)
There is a large BEC contingent over on Locostbuilders, so might be a better place to ask.
I 'think' that in general, the Bike engine is used, complete with injection, loom, clocks, fuel pump etc.
This is mated to a sprocket adaptor, that enables mounting of a driveshaft, then down to the car diff.
IIRC the Land Rover Freelander diff is getting quite popular for BECs, as it is quite a bit lighter than the sierra unit.
So basically, you are correct in that you can use most of a Sierra donor, and just fit the busa engine and wiring, although a lot of the sierra loom could probably be re-used.
Hope that helps a bit
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Sean
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