I just went down to Lowes and grabbed 20 feet of 1 1/2" x 3/4" soft wood, like pine (NO BIRCH! I made that mistake, and it was expensive) and a roll of generic metal mesh, and 2 sets of small hobby hinges. Total bill at the register was under $20.
A quick sketch of how I wanted it to function, and some measuring, sawing, nailing together, black high gloss paint, some tin snips to cut the mesh to fit, then a cheap staple gun to fasten it, and there we go! the center bar is the only part that is fastened to the tub.
Before
After
The other benefit of this topper is that now I don't have to have the heat lamps clipped onto the side of the tub, but instead sit directly on top, which is more efficient.
A quick sketch of how I wanted it to function, and some measuring, sawing, nailing together, black high gloss paint, some tin snips to cut the mesh to fit, then a cheap staple gun to fasten it, and there we go! the center bar is the only part that is fastened to the tub.
Before
After
The other benefit of this topper is that now I don't have to have the heat lamps clipped onto the side of the tub, but instead sit directly on top, which is more efficient.