Is that the vac kit from Cushman Paintball? From what I've been told, since it's vac formed a lot of detail is lost (which could be fixed by some added on styrene details); The plastic is .060 so maybe a wooden dowel run inside the full length and some expanding foam filler would be enough to make it sturdier...
If intricate detail is not a big deal to you, it might be the way to go, especially weightwise if you plan on trooping with it...