I’ve never seen a square window Scamp before.
1) I would give Scamp a call and confirm with them if they ever
sold with square
windows. They were super helpful for me with information during my (used) buying process, and have continued to be an amazing resource as I use and maintain my ‘91 19.
2) I would worry about stress on the
fiberglass at the window corners. Those sharp edges are stress concentrators. Unfortunately it’s really hard to spot
fiberglass damage (eg interlayer delamination) short of a catastrophic failure
Wish I could help with valuation, but I haven’t seen any good resources. A few years ago (2019) nearly all the Scamp 19s I saw listed were nearly $10k. Having said that - a fair number seemed to be sitting on the market for a while at that price. When I was looking at RV insurance they said the NADA valuation was <$2k ….