Thanks for all the info guys
Another thing I've been wondering about is the tabs: do any of you have a preference on where they are located? For example, I've seen tires that have tabs on either the tread or sidewall. Probably not a big difference but does one way seem to be easier than another? Or something like having the tread and sidewalls attached (like in my PDFs) or separate pieces (like most others I see).
Any thoughts on anything like that? I ask because I won't be able to test build any more models before releasing the finished version...