This is a little different and is primarily a tbar row platform, but turned around with a barbell in the landmine and it makes a pretty decent belt squat platform. Built with spare lumber, primarily 4x4 posts and 2x6s. Also a 2x4 that is used to rack the bar and start from a higher position for rows and belt squats. It seems as if the 2x4 would get in the way for belt squats and potentially catch you in the hamstring but I have not found that to be a problem at all.
Performance
Value
Build Quality