I used to make my own UMX size. I had to stop once depron became impossible to find. There R a couple of indoor places to fly in my area. When someone wrecks an E-flite, I usually will offer $30 or so for the electronics. I do not know why, but an E-flite UMX board is $60 and any additional servo is $17 plus the motor and gearbox which makes buying new cost prohibitive. If anyone knows of a substitute, please post here. These R a few examples of what I have built. The DC-3 is a little over 3oz AUW and the orange and white Dwarf is .75 oz AUW.