[Kevan]

Kevan - how did you forrm the glasswork?  Always a bugbear of mine....

I use thin plastic packaging, fruit boxes are thin enough, then simply cut a strip for the front and rear and hold one on place tightly whilst applying small blobs of superglue on the inside with a piece of thin piano wire then a quick blast of glue activator. 
Side windows are done the same way if you want to fit them. 
Once it's tacked in place you can go round with canopy glue or other favourite clear setting adhesive.
It'll never be 'showroom' but easily good enough for racing.