Richard Ottosen cut and drilled some mounting rails for me, out of some scrap wood. They’re standard Elf size, 3/8 inch wide by 3/4 inch tall by 6 inches deep, each with four 1/16 inch pilot holes for #4 wood screws.
I’d vaguely considered the idea of nice stained hardwood rails, but that doesn’t really seem in fitting with the general COSMAC Elf idea.
I haven’t actually mounted the boards on the rails yet, because I still need to cut and jump a few PCB traces.
Once I put these babies on my Elf, she’ll corner like she’s on rails!