Thanks for all the advice, guys. I've let the doors sit closed for about 2 weeks now and weatherstrips are taking a set and the doors aren't as hard to shut now--a firm push will latch them. However, I did have to drill a few different holes for the plastic retaining pins at the top, and the window on one side doesn't seat exactly right in the front slot when it's rolled up. At some point I plan to get the latex strips, but for now I can live with it. At least I don't have to SLAM the doors to get them to shut anymore. Thanks again for all the great input. You guys rock.