modeling is time consuming but to get the correct materials is the task. 
Already have the materials picked out, 6061 aluminum and 303 stainless steel for the barrel. I'm going to have this monster CNC'd and hopefully that will result in a box of parts that will all work.
However I'm going to work on a redesign, I had originally designed this to be an electric DROZD style air gun but after I saw and heard the thing and was introduced to the caselman, I decided against it and am now going with a mechanical system. I had originally designed it to work with 88 gram co2 cartridges but those seem to be rather pointless with something like a caselman that uses a gas blowback system. Of course I plan on modifying it to suit my needs but essentially it will stay the same and will end up wasting some co2 to recock the rifle.
What i mean by system is the rifle body really. the forend and that cap below the barrel was where an 88 gram co2 tank was going to be stored but that turned out to be a mistake. I had originally hoped to house it in the buffer tube/butt stock but I found out it's about .2 inches too small for the tank.
However that won't be a problem now that I'm switching to a paintball tank system. I'm designing this thing so it will work with existing ar15 parts such as grips, stocks and also any picatinny rail accessories to save myself from designing my own and accept popular features people may already be used to.
The bottom receiver is a Magpul lower receiver body however I have modified it to the point where it cannot become a real firearm without some serious modification and planning, and by that time the person in question would have been better of building a lower receiver from scratch.
