As I am nearly finished my cladding (one wall to go) I decided to see if the pre made windows would fit. After a bit of sanding with the Dremel (Im starting to love this tool!) most fitted in fairly well.
I'm not planning on glueing them in until much latter as I will prepping each one before installation. Most of the windows came with the kit. The only thing that is a little disappointing is that they aren't opening.
I have to admit, they really do start to make it look like a house and not so much like a shell which it has looked like for a long......long....long time.