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Its looking good ,
I want to mention from my Boating experiences that Boats have these very nice single windshield wiper motors/linkages that are *light* and surprisingly *small* made fairly high quality. They are actually somewhat affordable, being that they are Marine. $50 - $100 depending on quality. Probably to late to be giving you this information but its still good to know.

I am curious is your Avatar a depiction of your Car when its complete ?

For your foam taping

Drywall seam tape would work good with the spray foam, as it will breath so the foam expands and cures. I found out last month how covered spray foam cures, not well at all.