Im looking to build a custom "lower" assembly for my Tippmann 98C that replaces both the foregrip and the triggerguard with a single-piece part designed to look like an AR lower with a magazine in the magwell. Since it wont be taking any stress, a non-metallic material is perfectly acceptable. If needed I can whip up a Solidworks model and send it to the machinist.
Please post here if this is a project you are willing to undertake.