Simon told me he had sold a car to a guy in the US, not to me. If I was going to build then I'd really like it to be a Caterham. I've owned 2 and I'd feel much more comfortable taking on a build of a Cat than any other kit. That said, I'd consider taking on a Westie build at a push (plenty of moral and technical support would be forthcoming from Se7ens List if needed, I'm sure).
When I went round the factory they had a MegaS2000 in the workshop. Looks great as an out and out track weapon, but not really a tourer / occasional trackday car (which is what I'm after). I'll probably get kicked off the forum for saying this, but 150bhp is plenty for me