Looking good John, like the boxes and drums that you have placed in there. As far as I can see the cover for the cab, thinking back to the build I did, ran at a level right the way through, Try using Tissue paper if the netting does not sit right, that once the PVA glue gets into it can be pressed and moulded to how you want it. Failing that Miliput rolled out on a ceramic tile with talc can be stretched to a very thin piece and can then be placed and moulded to the shape you want. Once you have the required shape then let the air do the rest and it should look quite authentic when it is weathered and painted, or should I say painted and weathered?
Andy