In an upcoming project I am going to start with a foam board model from Flite Test, then cut part of the fuselage off and replace the missing part with balsa sticks. Gluing balsa is different from gluing foam board, so I decided to review some basic balsa building techniques for the benefit of those who are unfamiliar with the process. Here is the setup that I use when building balsa models. In this picture the bottom is a balsa building board. Balsa building boards are difficult to find these days. Someone told me that an acoustic ceiling tile will work. There are occasionally single tiles available from a damaged package at your local home improvement store. Next layer is the plan sheet. On top is a piece of wax paper to prevent the wood glue from sticking to the plans. I usually use thumb tacks to hold the plans down and building pins, or straight pins, to hold the balsa in place while the glue dries. T-pins are still available from several suppliers, including Tower Hobbies.