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Sure someone here has a 'busa kit car. Maybe @Brommers or @bq (TBH I only recently realised they were two separate people).
I don't have a 'busa powered kit car. I do have one with a ZX9R engine, one with an R1 engine, and one incomplete car with a Blackbird engine though.
Designing a car from scratch would be a bold move unless you've had a lot of experience in building cars before. Working out roll centres, spring rates and damping ratios from scratch is hard, and while there are rules of thumb you can work around, it's far from simple. If you're determined to give it a go, then a reasonable starting point would be the Ron Champion book on how to build your own sportscar, which gave rise to the Locost craze. The car in the book is front-engined, but it would be a good starting point to learn what's involved in the process.
P.S. The other issue would be bodywork. If you're building a one-off with a custom chassis then presumably you'd need custom bodywork. And that's a big, big job. It can be done - a friend of mine made a custom bodyshell for his race car from carbon fibre using resin infusion technology. However, it took him the best part of 9 months solid work (he's retired) to make the buck, the moulds, and the bodywork and he swears he's never doing it again.
Brommers-
I definitely appreciate it's a fairly mammoth undertaking alright and I'm conscious of not making it unpleasantly difficult so I think it may definitely be a better idea to try and utilise some existing suspension from a donor car and working from that but it would be nice to read up on it all first to have an idea of why I'm choosing a particular donor car and why it works well!
I feel like removing the actual suspension geometry from the equation makes it a lot more manageable possibly? I don't doubt the bodywork will be a big ask too, I was loosely thinking kevlar would be a good way to go but again I'm only beginning to think about this whole idea for a project so I'm not in a rush to get started until I've done the homework and come up with a good plan that should be achievable rather than diving head first into something I'll never finish!
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In a recent episode of Bitchin Rides, they did that - carbon fibre moulds. Professional garage, loads of staff and it took weeks to get it done.
Nahguavkire
TGR
Not dissuade you, but have you considered a kit car? You could then go for some mild modification of that as a starter.
Sure someone here has a 'busa kit car. Maybe @Brommers or @bq (TBH I only recently realised they were two separate people).