I am planning to use a laser cut metal sled. @aluminumwelder has a guy that he’s used before that I contacted as well. I have not had time to finish my sled design as yet, so am not sure what the final cost will be. I am planning to have 1/8" or 1/4" steel cut for the sled and then threading the holes to attach the router, z-axis, and such. On the bottom I am planning to attach arcs of 1/4" HDPE to reduce friction.
I’m interested to see what you decide on.