I have a scratch built rocket sitting in my basement in primer that could be the twin for this one. Hard to guestimate the dimensions on yours from the pic, but it looks amazingly similar to mine. Mine is 3 diam. and 33" tall. I will get a pick of it and post it if I get a chance. After you fly it, post the size and weight of yours, how it flys and what motors you used. This will give me a good idea of how mine will perform.