Which things? haha
LCA skids were made out of a 1.25" wide angle piece 3/16" thick. If I had to do it again i would go 1" wide. I chose a smaller section but my local pipe supply place had 10' for 7 bucks and change. Total: 7ish
RCAM skids were made from a 3" wide by 3' (i think) piece of 3/16" steel. Got it at Lowes in the steel section for 15ish bucks (one piece will get you two skids). Hardware (7/16" bolts, nuts, and washers) was another 5 give or take. Total: 20ish for two skids
Other stuff I bought for the project, you may or may not need these. Dewalt 2x bi metal blade (14/18 i think), 5 bucks. Similar strength jigsaw blades, 5 bucks.
Grand total: 40 bucks (technically 60 because I made two sets of RCAM).
The biggest thing that isn't factored in is time. It took me a while to get the skids cut where they would fit properly (my inside piece looks real funny due to how the link mount is shaped). And then when welding them together takes a while. Even welding them in a jig to keep them at 90 degrees doesn't make them perfect. I had to tack it all together, test fit, maybe whack a side off and redo it, maybe grind it down at the end. Obviously you could gain some time if you use a plasma or something like that, but all I had was a sawzall, jigsaw, drillpress, and welding junk so it took a bit longer.