Building from Scratch or follow some plans?

[Monk]

Ok no sniggering at the back! :heehee:

I had some time at work to mess around. Ok it only shows three components but its a start! This is the x-axis I was going to make out of 4080 extrusion. Fixed together in a L shape with the rails on the top and bottom. Will this be strong enough over approx 1200mm or should the extrusion be bigger. Also when the bearing blocks are fitted, do I build off the blocks to account for the ballscrew between the rails, or should I mount it behind and build the z-axis to sit acutally over?

If I fixed the aluminium plate or extrusion for the z-axis to the bearing blocks it would sit quite close to the x-axis.