I checked it out and it seens fine. but im allso looking at it like a 540 with the wing on the top of the box. I got a piece of 1/8 balsa and cut out a fuse side. the stock ply side is only a little heaver. NO BAD. The only problem im having is the cowl. no matter what i do it wont look like a 540. I check on cutting the canopy shorter and it looks close.
I will do a little more thinking in the 540 but its starting to look like its going to be a real lite 300