DAVE LOWERY finds the answer to a modelling quandary has been under his nose for some time.
Unwanted apertures in the Skytrex Mk 3 sides were in-filled with plastic card, bonded securely from the inside with a good fillet of glue. I use a combination of UHU contact adhesive and Superglue to achieve a stable infill, allowed to cure overnight. Isopon P38 automotive filler was then applied to the outer face to fill any gaps. After sanding the filler back to a smooth surface, the new machine-cut window frame overlays were used to help mark out the new windows, which were cut to size after drilling pilot holes in each of the corners, removing the bulk of the waste and then using a file to carefully fettle the material to achieve the final dimensions.