Hey Usmc-butler, thanks for the kind words... The "great stuff" I believe you are talking about from lowes is that weather proofing material in a can. You may find that it reacts with polyester or epoxy resins in that it may melt. The stuff from Tap has no reaction with resins and can be used as a filler or more commonly to make molds. In making molds you have to use PVA on the part you are going to mold and pour the foam over the part. Putting the part in a cardboard box helps to contain the foam. Its not the way I like to make a mold and very messy. On my 89 batmobile I taped off voids in the unibody and sprayed the Lowes stuff in a can for sound proofing. Some of the material came out holes I didn't see and after it dried I simply cut it off. Really helped to cut down the road noise.
I got my parts for the window cutting and if successful I will post where and what I got. But like I had mentioned before I have three different methods that might work. I'm willing to give it a try in the name of science. Lol And I do expect some broken glass. Glad you like the Big Kahuna project and it is a build for a good cause. So I'm hoping the hydraulic steering and driveshaft assembly turns out good. Thanks again for looking and I do appreciate the opportunity to share....dave
PS I did get those side markers from you as promised. It was amazing how you got all those markers, bulbs and switch in that little box!