Aluminium Profile Type Router - Initial questions

[CNCRY]

700 x 500 x 250mm steel cabinet arrived today from TLC. Very solid and heavy @ 20kg. - hopefully everything will fit in based on previous builds on here! I see Andy had 800x600 which had a little space spare.
While I wait on the linear motion parts from BST - electronics are being planned, really steep learning curve here for me and hoping I can figure it all out with some of your help.
With the LCDA86 driver Jazz recommended, what voltage would be ideal. Its up to 100Vdc and I see a few people have used 68V - so would give some margin but would that be at expense of too much power?
LC60H2112 is listed as 5.6A current, so with 4 motors do I need 22.4A x 68V = 1523VA PSU? Sounds huge.

I'm trying to take each component in turn and map out the connections - first the driver to AXXB-E. Except for ALM I can't figure out which other terminals need to be connected if at all ? For example ENA+, Pend, and the Encoder E* ones.
AXXB manual refers to just Step and Dir.



Edit..Just realised VCC/GND wrong colours on that IMG..

Thanks
Ryan