Latest update. I checked it out in FS2002. It's definitely a CFS2 multi-LOD design & looks just the same on my system. The good news is that it's an FSDS1.x design & tweakable with Tcdfsview. The bad news - no luck so far with the usual tweak but I'm more used to CFS2 aircraft. This would be time-consuming as it's a matter of trial & error.
You might like to have a play around yourself. Download Tcdfsview here.
http://www.simviation.com/fs2000utilities_ess2.htmUse it to open the MDL file & experiment with the zoom values. The higher the zoom value, the smaller it will display in the sim on the standard zoom setting. I've already tried the zoom 7 & zoom 10 values which usually work for this sized aircraft. Don't go higher than the default zoom value of 16.
PS. There's no guarantee this will fix it. You could spend hours messing around with no luck. It might be better to find another P-40. IMHO