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The offsets should be stamped somewhere on the back of the rim hub or spokes. An online tire calculator can help determine what will fit without modding the car.
Just an observation that the rim lip seems very thick as seen from the pics. IMHO this is contributing to the tire sidewall appearing to stand in from the rim. A ‘rim saver’ tire sidewall contour might help to minimize this effect (but it seems that your existing tires already have these sidewall extensions).
Best luck, I always enjoy seeing your projects. Your car always looks great!
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Rgds, Fred
#317 550 Spyder Anniversary Edition 2004 Boxster S, 3.8L Flat Six Innovations engine, PSS9s, etc, etc . . .
The contents of my posts are for entertainment only. As confirmed by my many motor sports fails, I am not qualified to give product endorsements or mechanical advice 
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