Am I heading in the right direction?....

[Lloyd]

Those links look great! Thank you...

on the design I'm working on, I've now change all rails to square profile type RE your suggestion...

I see what you mean about the epoxy method...

a design I'm trying now (based on a cnc I've seen) is to use 90x60 aluminium profile, heavy duty, which will hold the rail and will be linked to the steel sub-frame at 5 plates along its length - each plate will have 4/6x M10 stubby bolts to allow me to make fine adjustments to the level.

Ive be attached a pic of the design in progress with this system - probably pretty confusing - I'm not using any regular design program, only what I'm used to, illustrator... But with some inspection would give a rough idea of where I'm heading... Anyway, it's certainly not finished, once I'm finalised on the equipment, I will modify the design to suit...