Hi Ducksterman.
I'm at the same stage you are. I just built a 3 hooked geared turning head with a 3 speed fan motor on it. My board looks like Swiss cheeze with all the holes in it. I'm building another board & I'll be using those t tracks.
I've seen them for any where from $9.94 to $29.00 for a 4 ft length
The cheapest is from McMaster Carr. If you get a better price let me know.
I was just going to screw them down to a board & use bolts into wooden dowels.
http://www.mcmaster.com/#1850a19/=3vkgtp