Just one more reason I love HF. Awesome job, fin. Try a 6" x6" x 1/4" steel plate as a foot.
Cut your connector sleeves in half or purchase single sided adapters and weld to plate. Drill a hole thru them and stick a bolt into them. And try drilling a couple holes in the plate for staking down. Scaffold supply stores carry footing plates as well, not sure the o.d.-i.d. are the same ,so bring along a chunk of pipe when you shop for these. Beautiful !!!!