HI - we have a 1989 Captain
(same manufacturer, bigger trailer). We used closed-cell foam from a foam place in Kitchener. Came in roll. We used the glue recommended and used a sprayer for the glue with the intent of throwing it out when done rather than cleaning it. As these trailers have relatively flat surfaces, it is a lot easier than a Boler
with all those curves. We then covered the foam with boat-hull liner from Len's Mill Store (we didn't know that was what it was until later). Will not mold or hold water. Some sort of synthetic. and reminiscent of corduroy. It was glued to the foam using the same glue. It is important to use glue that won't dissolve the foam.
can be ordered from Europe. We have used gomarketplace.pl (poland camping supply on-line store). I also discovered that the Alto trailer from Quebec uses the same european acrylic windows
and similar hinges and latches so you might be able to get windows ordered in from them if you want those. they have nice tinted ones. I think we might just get some auto window tint film and retrofit ours.
Hope to see you at Bolerama some year. Google to find it.