hi, i'm sorry to just pop in as a newbie and ask a question, but, i will anyway.

i'm building an upscale alien invader. approximately 12x. i have the original plans and know the tube diameter, but i'm not sure of the body tube length. can someone help me on that?

i'm a high power guy. level 3 tripoli.

i'd be happy to share photos and updates of the build and launch.

perry