cool that should be fairly simple then as i can get a pulley straight on the shaft and motors, i may have to put a extra pice of extrusion across anyway to take the motor mount so not sure go off centre is going to make it to much neater, i think i have a little ocd on things being symmetrical as well.

What i will also do is try and get the bk and bf blocks in line with the top of the alli so the stepper does not drop to far bellow the gantry. I would have loved the belt and motor to be all inside but that doesn't look possible with this design.