This is just the remix customizer version in case you need to adjust the parameters. I also made some mods such as remove the wheels, nuts, enlarge the bottom hole to M7 for eccentric nuts.
Note: the width can be extended if you want, but the length is currently for 2020 extrusion. For 2040 extrusion, you can add 20mm. Any other values for length might not have the wheels setup properly on the rail.