Glenn, I meant the rear section of the cockpit roof interior, provided as a clear part in the kit. This has depressions moulded-in, representing the lightening holes of the metal panel on the real aircraft. These really benefit from being drilled out, as per the photo of my build. It's best to paint the parts first, as this makes it easier to see where to drill, as the clear part is rather brittle, and the holes not easy to align with the drill bit if left 'clear'.
I found that the main landing gear could not be conveniently fitted after the nacelles were fitted, so I wrapped mine in kitchen foil when the spraying was done - cling film works better, as it can be 'moulded' around the gear, but I didn't have any at the time.
The wings can be joined, and slotted on to the spar - do a test fit first, with the wings taped together, as, from memory, there may be a bit of interference fit, which might need filing and sanding a bit,.
PICS 1 and 2. The cockpit rear, internal panel being drilled, after first painting the parts to aid alignment with the drill bit. The holes can be re-touched after drilling and cleaning.
PIC 3. The main gear wrapped in kitchen foil as a mask for spraying.