I think the answer to your problem is build another roadster and have two! Have one set up soft for the road with civilised suspension etc and a full caged track warrior. That way when you either blow the engine up or hit a tyre wall you can still drive one the following weekend,simples.
Second the building of another car. We are doing the very same thing although it's a rather different car this time.
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Built February 2009 using Mx5 components.