Welding up free T-slot extrusion instead of bolting together a frame?

T-Slot Aluminium Extrusion - 30x30mm PG30 Profile aluminum extrusion t slot T-slot extruded aluminum profiles We've all seen the stuff, the “Industrial Erector Set” as 8020 likes to call their version of it And we aluminum slot wheels This American-made aluminum extrusion is 100% compatible with all leading manufacturers' fractional and metric T-Slotted Extrusions

aluminum v slot 30 Series 8020 Modular Extrusion with four open t-slots to accommodate 30 millimeter x 30 millimeter based joining plates, brackets, and accessories