Am I correct in assuming that these are all 1/32?
My 1/18 Corsair doesn't have a window, but you are certainly right in saying it's a -1D. As for the fit on it, I didn't have any issues putting together, but I don't ever fold the wings either, I know somebody who broke his trying, nor is there a window in the bottom, although these may just be the differences that come with different scales and such. As for the Fw 190D, the issue I have with it is the tail wheel doesn't like to stay in OR out. I pops in if any pressure's put on it, but if it's hanging on the ceiling (like mine always are) it comes out. Also I think the tires are either too small or the main landing gear are slightly too short. But I like them mostly for the shock value. People walk into my room and see the 1/18 Avenger as soon as they enter, and they always comment on how huge that one is and the others as well.
And keep the critiques coming, I have no issue with them. Like has been said, yes, they have inaccuracies, but we (and obviously you) still like them. I personally have not taken a really close look at any of mine, besides looking at the F4U one day and noticing the drop tank attachments.