You don't make it clear why you want to stick with a .10 size engine and airplane. However, if you're not really zeroed in on that size, you might find that building larger airplanes is much easier. The smaller sizes, such as the .10 to .25, use much smaller and lighter pieces of balsa that can be very difficult to work with. I have tried a couple that used 1/32 or 1/16 balsa formers and bulkheads and 1/16 square stringers and find that merely bumping them can result in broken pieces. In some cases, the balsa was much like tissue paper and very difficult to work with. The larger planes, .40 and up, get into wood that I can handle without breaking. Maybe it was that I am clumsy or maybe it was the particular kits, but I am finding more and more that the larger the airplane and individual pieces are, the easier it is to handle them without breaking. Just a thought