Windows are too long!

I've been doing some test fitting of the window frames and clear 'glass' inserts. Much to my surprise the main 'glass' pieces are too long for their openings, although the frames fit just fine. I suspect these windows were made for another kit, and were assumed to fit this one too.

It's no big deal, just a little annoying. I'll cut that bottom portion off each and they should then fit quite well. I'll also probably need to add a thin styrene panel in the bottom section of each window to make the interior look clean and logically constructed.