Gary, thanks for the reply. Below you will find photos of track cleats I made a long time ago and have not used yet.
I would make a few changes next time.
By edge gluing pieces of wood together I could rout a bead along both end-grain edges instead of sanding them later.
Another would be to cut the cross grain cuts first on the cleat and track guides so they don't split off at the corners.
I cut one side then flipped the part over, using guide pins for alignment.
In the following photo the shim to the left positions the first part, the one in the center spaces the two parts, and the right one keeps the part parallel to the metal block.
The sections are pinned together with a paperclip held in place with one drop of super glue on one end. The holes are drilled with a 1/16" bit which leaves ample clearance for the paperclip.
Dale