Hello to all. I purchased some 4" and 4.5" flush-type inspection covers from Mr. George Race of
http://www.mrrace.com. He also builds custom size flush baggage doors. It appears that he can make just about any size or shape in any thickness. Nice workmanship, fair price and very prompt delivery. I'm hoping to use the inspection covers for the aileron bellcranks, wingtips and wherever else it makes sense. I am not connected in any way to this company, just wanted to share the info.
Gunther