What I did to get the 54" pieces is lay the 48" piece right at the edge of the table. Then overlap the extention piece over the 48" piece by about 3-4". I then place a square over the top of the two and hold the two overlapped pieces tight against the square. (the bottom thick piece of the square overhangs the table as it is thicker than the two sheets). I then cut down through BOTH pieces with a razor saw at the same time while using the square as a guide. This way the cuts will match up perfectly. Even if saw runs off the guide (edge of the square) it doesn't matter as the inperfection will match the other exactly. If the description doesn't make sense, I can take a picture if needed.

On my next plane I think I might do as above, only cut the two pieces simultaneously at about t 30-35 degree angle. I think will make sanding a bit easier.

I don't edge glue the wings or stabs (just taped well) as the poly glue works it's way up during bagging. I do tape the turtle deck and belly pan as it's easier to wrap the sheeting around the harder radius without the tape.

..........Mark