Going over sharp corners is not a big deal. If a person can cover a wing upper and lower with one piece, my hat is off to him, but it is not necessary. The cloth is so light that it can be overlapped, and spliced at various spots, and after the second application of resin you cannot see or feel the joint. After the first application of resin, which is to just seal the wood and bond the cloth to the wood, sand very lightly the seams you made. The second application of resin is a fill coat to fill the weave. The traditional .6oz glass cloth used for this purpose requires very little resin to completely seal the weave. Some people do not even apply a second coat of resin, opting to fill the weave with primer instead. It works just as good, and is strictly a personal preference IMO.

Vince