Added steel channel to X-axis c-beam

[wiremonkey]

OK, so I'm solid on using the 2" x 6" steel tube for the X beam! I have a few more questions for you good folks.

- 1/4" inch steel plates for the end caps on the beam? Or should I go thicker? 1/2"?

- 20mm round supported rails and bearings ~$80, or spend the extra dough and get linear rails and bearings ~$240!
The other factor on the square rails is that I'll have to have the steel beam milled, which will probably cost $200 or more, whereas the supported round rail is far more forgiving when it comes to alignment. The rectangular steel tube has a round crest to it, but it is fairly consistent along the length of the beam. I'm thinking that I can screw the supported round rails right to the beam, maybe a little shim stock if necessary, easy peasy.

VS.

I'd love to hear your thoughts on these two issues.
Cheers!