I thought I would post a couple of photos on a gun rack that I recently fabricated for my RTV. I have approximately $150 in materials in this project and maybe 3 hours of time.
I've seen designs similar but not at that price. Does your design allow for the guns to be removed and other components to be put in? Thinks like tool rack, fuel packs...
I could have designed it to accept other things, but I only built it for use as a gun rack. It wouldn't be very hard to modify this design to be able to accept addtional items. All you would need is some additional 1" sq. tubing.