I found some steel pipe at the hardware store. It ws a tad undersize, but that wasn't an issue. I didn't measure it, but the wall thickness is prolly something like .062.
I cut two pieces .75 wide, then cut about 40 percent away. I had a piece of thick walled pipe that was 1 inch OD, so I forced the pipe pieces over it to open it up to proper size. The I filed the cut ends of the pieces to proper length to fit over the trunions and just touch the wooden base (just like Tropico did I believe),
Then I cut 4 pieces of .125 thick, .75 wide, 1 inch long flat steel.
I decided to braze rather than weld, as I figured I would cut thru the thin walled pipe before I was finished.
I took another piece of the .75 inch stock and stuck it in my vice so that about half of the side was sticking up above the vice for the entire length of the jaws. This made a nice straight edge. I put the half-section of pipe with two flat pieces all end to end on the top of one of the vice jaws, up against the piece of flat stock sticking out of the jaws. The flat stock in the vice jaws made for a straightedge and helped to keep everything straight during the brazing.
I welded it with an oxy-propane curring torch. If you try it with a 1 pound cylinder MAPP gas torch, the vice may soak up alot of heat and you may have a harder time reaching brazing temperatures.. Some sort of different jig that draws less heat away would maybe work better for you if that is what you want to use.
the first side came out OK, the second side nicer. You really want to get it hot so the braze rod flows nicely. I used a flux coated rod, but added addtional flux powder as well. The added flux seemed to help and allow for less heat to be used. Remember that you need to get the flat stock resting on the vice hot, and not let the 1/2 round pipe that is stilcking up in the air get so hot that it starts to burn. Focus most of the heat on the flat piece.
It's 100 degrees here at 8 PM tonight, and the torch made it hotter. I'll drill the holes in the trunnion caps tomorrow night.