I have been looking around for a set. The Woodpeckers have been retired.
I have a CNC mill and decided that I am going to make mine. If there is some interest, I would be willing to make a few sets at cost for members here.
I have to measure my machine I think the X travel is 46 inches, so that would be a limitation, not a biggie but a need to know for you.
I was thinking aluminum, but will take suggestions on alternate materials. I will base the cost on getting it from McMaster Carr so all can see what the price should be. If there is enough interest I would try to get stock from somewhere cheaper. I am in Cleveland, Ohio and there are lots of suppliers for such material. You would have to pay your own shipping of course. And we could all settle on the correct final dimensions for the cauls. Probably a can of worms, but who knows, it might be a good thing too.
Let me know.