Fitting the windows

It's important to pilot-drill all the srcrew holes with a very fine drill, taking care not to go all the way through. I used 2.0mm for the job. This prevents the wood from splitting when you put the screw in. It also gives the screw a good true guide to follow which is important when using large dome-headed screws.

I found that if you put four "key" screws in first it holds the Perspex to enable you to drill all the other holes without fear of slippage.

Great care and patience was called for here!