Yeah, I built the one for my blue burst a few years ago. I'll never go that route again as long as Bob Shade sells them.
What a PIA to make. It was harder to make the vibrato and adjustable bridge than it was to build the entire guitar from scratch. I used 1/8th inch aluminum plate for the base. Then I used 1/2 inch aluminum stock to make the bearing holders. 1/4 inch stock to make the top of the rocker assembly, 3/8th inch stock to make the part the strings go through. 3/8 inch round stock for the string post, and 7/8 inch aluminum channel for the bridge base.
Then there was hours of hack sawing, drilling, tapping and constantly breaking drill bits and taps. Filing, sanding buffing, all an absolute miserable frustrating time. All of the pieces were mated together by 4/40 screws from the underside. Unless you live where UPS or FedEx doesn't deliver, I would never recommend making one from scratch.
Here's a picture of the one I made when most of the hard and complicated work was already done. As for the final results, it works OK, and after I finally found the right spring it stays in tune.

Finshed product.
