Mx5 with bike engine

[matt_long247]

Hi guys.
I've decided I'm going to build my roadster based on the mx5 donor.
But I want to use a bike engine - undecided which.
I Haven't decided whether to use the Saturn or vodou design.

Just wondering if anyone else has used a bike engine in a mx5 based one before as I can't find any.
And which design would everyone recommend to use for the chassis and why?
Any other info would be much appreciated.

Thanks in advance.
Matt.