It looks relatively easy to make the Standard / O gauge combo crossover. I found a Dremel router table for about $30 and need a 1/8 inch bit. I hope the table fits my battery powered Dremel. Now, I just need to find 11/16 inch plastic stock. I have some 1/2 inch Corion from a kitchen demolition that would work but might be too thin. I need to route a depth of 3/8 inch for the rail height. I could also get 3/4 inch stock and sand it down a 1/16 inch.
George