The EASIEST and CHEAPEST way to build with aluminium extrusion

The 40mm shape has a thicker wall that will accommodate heavier applications Applications include machine frames, workstations, shop carts, and tables

Honestly I haven't seen how other people are doing it but this is how I do it and it's been

4040 v slot 4040 LIGHT T Slot Aluminum Profile

4040 t slot Aluminium Extrusion · 2040 Corner Mounting Plate · 3030 Hammer Head bolts 20mm · 4040 PG20 T-Slot Aluminum Profile