A while back I built the HO scale ArsenalM Matterhorn gun in resin.
They were in batteries of four or six. I went with a four gun battery because the kits are fragile and pricey.
I used Evergreen plastic tile to reinforce the side stands because the photo etched parts were rather bendy.
This is the metal piece. Just trim out the metal pieces. I tossed most of them, too fragile would not survive even in storage on my first on, they certainly would not last in a wargame. I kept the two side rails, an elevation wheel and some handle bit. I actually trashed the others to prevent me from using them in the future. I got mine from my friend Randy at Fidelis Models.