The legs were almost a necessity for my totally ghetto brew rig to work via gravity. I'd rest the HLT with the long legs on top of a card table, a cooler MLT sat directly on the table, and the BK was on the ground on another Blichmann burner with the original/short legs. I did have to lift the BK to sit on the table to drain into a carboy at the end of the session, but that was manageable enough.
The 24" legs bolt in place of the stock legs without any mods required, the holes are all drilled already. To have them mount to the outside of the stock legs as I did requires drilling both old and new, best done with a drill press and a jig so all the holes automagically line up.
The stainless plate under the edge of the kettle is a heat shield to protect the ball valve, thermometer and sight gauge. It's provided by Blichmann with the burner...
Cheers!