I think Rob pretty much summed it up above ^^^ (btw, I'm not a professional driver, just a wannabe that needs the tools to compensate
)
One thing I forgot to mention is re-sale (if you're the type of guy that cares about that). I'd hazard a guess that if I ever sell my project, a one off chassis will detract to 95% of the audience.
Enough guy's here know of and lust over RS's stuff so you'd be ahead there for sure.