Looks like you have that bulkhead lined up pretty well. I used thick superglue and accelerator as a filler and used a flat needle file on it followed fine wet dry sandpaper.
I looked at all my pictures of P-36s and found that prop mark on quite a few of them although not any close-ups. Not sure what it is, sort of looks like a diagonal stripe of some kind. The best picture I have of it is below. Maybe someone else has a close up of it.
Something else I thought of to tell you is the windscreen framing. There is none, except the outside framing. The P-36 as well as the early P-40s had a windscreen made up of one piece of plexiglas. Inside there were two thin pairs of brace rods that went from a bar across the top of the windscreen down to the structure behind (or rather ahead) of the control panel.(see pictures) For a long time these brace wires have been mistaken for windscreen frames so that they are molded into just about every model of the P-36 and early P-40 including all the HobbyCraft ones (It's actually correct for the Hawk 75 M/N/O but that doesn't apply here, completely different windscreen). You can sand the raised lines off, sand and polish the windscreen and try to add brace rods inside, or do what I did and leave the molded lines and just not paint them. I think the unpainted mould lines look like a pretty good representation of the thin brace rods in this scale.