Bongo Fury

Hello.
We have a Bongo with a "mushroom" style pop up roof. It gets very hot up there in Spain in summer and we're looking to fit a window, ideally with insect mesh too. Anyone got any recommendations on who would be able to do this? W Mids area preferable...
Ta!

Not got any contacts but when I started looking into the same thing people said to me go to a sail maker.