I think the round windows look best, perhaps the color needs to be a tad lighter. Light maps are a total piece of cake, a baboon could make 'em. Just take the finished texture, in either Photoshop or PSP desaturate the color to greyscale, then darken it. put a dab of pure white on the windows, then darken it all the way and whiten the windows again. Save it with the "i" at the end of the file name and that's it!