I really love the x-10 express by Leading Edge and would like to find a similar looking rocket ,only larger (I really love the holes in the fins) What would be involved in reproducing the x-10 in a larger size .I would like to fly C and D size motors and think an X-10 of about 30 inches in height would be awesome. I've built 4 skill level 1 rockets so far and would like to up the challenge ,just a bit. Also,probably a real easy question for you folks but what is clustering of motors as opposed to stages? Thanks for your time