Hi,
When I built the kit I ended up using the Eduard PE sets, Interior and exterior.
I think the glazing provided by Eduard actually has an outline printed on the clear...I think. Maybe Eduards website might have some pictures.You could make a pattern out of masking tape and transfer that to some clear material and then cut?
When building the kit, you really need to dry fit the cabs before glueing, they are very tricky to get right.
The wheels and tires are junk and I think someone now makes an aftermarket set, good investment.
This is any early Dragon effort and the engineering isn't quite what it is today so dry fit, dry fit, dry fit, and you'll end up with a spectacular piece.
Good Luck,
Peter