Sheet of Treadplate (cut to size when purchased)
4 lengths of aluminium extrusion
4 flightcase corners
Other stuff you'll need:
A saw to cut the aluminium extrusion
A metal file
Super glue (cyanoacrylate)
Step 1: Measure Up
Do remember when measuring your extrusion that the size of the table will be the inside length of the extrusion, so allow for the additional thickness of the extrusion in your measurements to ensure a snug fit.
Step 2: Assemble!
To fix it all together, I'd simply recommend holding everything in place with gaffa tape on one side of the joint whilst you glue the other.
then wait a bit more...
Once the glue is dry, remove the gaffa tape and put the frame on the table.