I don't do 3 gun, but do CAS, almost the same requirements for a cart. I assembled this from a kit last fall. If you are carpentry skilled, there are quite a few free plans out there on the net.
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It completely comes apart in a few minutes, to fit into a car trunk. The upper box holds all the stuff and opens up to provide a work surface for loading my C&B pistols. Lower box holds extra ammo, cool drinks and lunch. Designed to be sturdy enough to sit on as well. Sun shade/umbrella not included......at least golf stuff can be re-purposed into something useful.