OK. here are some photos that I'm sure can get you started. Its hard to make in much lighter than this at 1.1lbs with no radio or camera gear. this mount will work for the 50's too but on the 30's use a big motor like TT39 or OS37 both with the Hatori SB-6(?) pipe or the Toki 40's for max power. If you want to make it for a 60-90 size ship just step up to a lager size PVC and use "T's" and pipe both for and aft as sprader bars instead of the arrow shaft glued in a drilled hole as I did. Make the base 25% or so wider than the top to prevent tip-overs, cut and fit all your parts and square them up as needed. When satisfied, a drop of thin CA at all joints is all thats needed. The bungees I use work the best and are just snug enough to hold the mount to the skids with out it sliding any direction yet in flight they stretch a bit to help keep any vibration from going thru the mount and bluring my shots. Print a pic and head off to Home Depot and make any mods you need to suit your app. PM me if you need to brainstorm and send me pics of your creation. I'm always looking to steal someone elses idea