yes the bullet factory was an amazing place to go through I have the opportunity to be given a guided tour with the MX5 club and it is really well setup place but I can't afford something that expensive
just be careful with the conversion as they have like a reinforcement bar down the transmission tunnel (don't cut it in anyway as it is structual). It maybe a bit lighter but it ruins the handling of the mx5 (as it is a perfectly weighted car )
mike here is the website all about mx5's and their conversions. I know the member Low miata he can tell you everything you need to know about the early model mx5s
http://www.aus-cartalk.com/
well thay were saying a 300hp sr powered on was an animal on the track, not that is not even pushing the sr motor very hard at all, imagine what would happen if you decided to say get a crate sr engine from someone like tomei or jun
instead of the rotary (I think they won't let you do that conversion anymore as they changed an ADR rule approx 6 months ago) and it costing approx $7500 to move the steering rack forward and other bits to accommodate the rotary motor how bout sr20?
It fits, is as light as the bp6 so won't upset ballance and you can fit a sr gearbox and diff under them with out too much hassle. There is a company in melbourne that produce the mounts for this (laser cut alloy mounts) for bo th the engine and the gearbox. Well just a thought.