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I made one from a 18" square base 10mm, 1.3 m tall 7mm thick 150mm circular base, plus 4 1.1 metre 7mm think 15mm long gussets.
cost materials $300
Got a friend to tig weld it,
cost = 2 cased beer $60
bought a 25mm drill to machine holes to let bolts secure it to the round.
cost = $48
Bought a 150mm * 75mm aluminum head to secure it to the vertial steel cylinder and a 160mm 3mm stainless steel top plate
cost = $95
Paid a machinist to machine it to mate the top plate to the aluminium head, drill a well for the mount and ensure the aluminum slug mated perfectly with the steel sleve
cost = $85
Bought stainless steel bolts 8 and the right drill bits to lock the aluminium head to the sleve
cost = $30
Cut a window to tighen the mount to the aluminium head when its all secured to the steel sleve (already had angle grinder and cutting heads.
Galvinised it and painted it gloss black
Cost = $30
So its purpose build for around $700 versus generic job for $1,000
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