this would be using 2"x1/8 steel bar and 3" x 3/16 flat x filled with re bar and glass fiber concrete mix x/y 6' x 6' with z 1'x 9" (acme 10 tpi) gantry estimate 130 lb --- for the corners on the guide trucks i would cut half way through the 3/16 flat and bend it to 90 and fill with weld ---any help on the design would be awesome!!! also great accuracy is not crucial this is for versatile hobby art.:wee: