Seabird Aviation is the B.C. rep for Challenger Advanced Ultralight. The air frame of Advanced Ultralights are assembled at the factory with all control cables in place. All you have to do is assemble the wings and tail feathers and cover with the fabric supplied. The fabric is shrunk and coated and then you apply your chosen paint scheme. The instrument panel has to be wired and the interior has to be finished. All this you can do yourself at your place or in our heated workshop or you may have the Challenger professionally built. We have a professional builder available. If you are in a big rush we will sell you our demo model ready to fly and we will build another demo model.