If you can get a complete RS motor and electrics then it will be sound, but I bet you are looking at a good £500 for a useable motor.
You won't be able to run lights (without some more modification), but as you saw on Sunday (Stephen & Fontyyy), that's not necessarily a problem.
An RS top-end also needs pistons and rings regularly - probably more so than the F3, else it all goes Pete Tong rapidly.
Don't get me wrong, I'd love an RS motor in an NSR chassis. An NuRSe is one of my "one day" projects, but there is a lot to figure out first, and a lot to learn from the NSR motor first too.
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Andy.
NSR-WORLD.COM
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