Am I being silly?

[brman]

I used 20mm fully supported rails as they are cheaper and much more tolerant of alignment errors than Hi-Win. Despite coming off the tip the 65mm box section steel the long axis is mounted on looked flat enough to me and my 1m steel ruler so they are directly mounted onto the metal. The gantry is 2 pieces of 50 x 100 mm box welded together and though the surface seemed much flatter than I would have expected I used epoxy to level the face. Unfortunately this was before I knew about the West Systems 105 resin and 209 hardener combination and my chosen goo was too viscous. The result is probably worse than the underlying metal and will be re-done during planned upgrades later this year once we get into winter and the shed daily maximum temperature drops below 50C.

Thanks, more food for thought.