Hi Ed, welcome to FiberglassRV... we're glad you're here.
I see there's been some views and no one has answered your questions (yet), so leave it to me (the blabber mouth) to at least give you an opinion.
If you have the wonderful jalousie windows
, consider keeping them. All the parts are fixable and replaceable. The nice part is they open thoroughly and even when it's raining... no rain gets inside (unless it's coming down sideways!). Sliders open up less than halfway and let rain inside. (I'm VERY biased and would swap my sliders for jalousies in a minute). If you're still determined, you can buy windows from Scamp
... but it's not a direct fit (jalousies vs sliders) and would require fiberglass work in the corners (jalousies have 90 degree corners, sliders are radius).
If your Boler
is like most egg shaped trailers, you cannot replace the front window with glass (unless you can find an early 80s window out of a Scamp), it has to do with the compound curve and glass doesn't just curve. The back window MAY be replaceable with glass... IF the back is flat. Even early Scamps had rounded rears and can't use glass windows.
To determine if your trailer has compound curves (and would need "plastic" windows) place a straight edge (2x4) right in the middle of the area that would be the window area. If the edges are NOT touching the straight edge, you have a compound window area and a glass window, as a direct replacement, is not possible.
Anything is possible if you're willing to do quite a bit of fiberglass work. Build up the area to change a compound to straight and fill in 90 degree to radius....
I hope this makes sense?