By the time I was ready to buy a Leviathan they were out of production. Fortunately Estes had the upper and lower body tubes available for sale along with the engine tube and 24" chute. I had an extra fin from a Scion kit which is the same as the Leviathan fins. Based on that I had fins made at a wood working shop in East Boston. I bought the CRs and NC from BMS. Engine retainer from Aeropak and rail buttons from Apogee. Nylon shock cord with eye bolt attached to the upper CR. Nick's kit came out great. Nice cert flight, congratulations. The third kit on the right in my photo is my Leviathan. Best kit Estes ever made.