No reason at all why you couldnt build a Haynes using Sierra or MX5 donor but use the BMW engine, gearbox, induction and wiring loom.
You would then be on familiar territory for most of the build and would just need to do some mods for the engine and gearbox mountings.
Alternatively you could get a bellhousing adaptor to marry the BMW engine to a Ford type 9 gearbox.
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