I measured and cut the 3/4" plywood to lay in the aft end of the interior. This provides a platform for one of my small assistants to lay in there and buck the rivets for the aft upper skin. Any volunteers? I'm not quite there but will be soon - I have been looking at the weather and it looks like I have a small window on Saturday morning between 7-9am that the humidity will be below 75% and the temp will be at or below 85 degrees, so fingers crossed.