What order would people recommend for a CDS, XPS, 82, SuperCap and two 135s in vertical racking (gap between top of unit and the wooden shelf above is around 3cm)?

Your priorities will be to get the power supplies as far away as possible from the low-level circuits.
So starting from the bottom, I'd put the two PSU units on the bottom two shelves, the power amps above, the preamp next and the CD on top, preferably with another layer of isolation.

Ideally, the CD player should be on its own wall shelf (Hifi News make a good one in their Accessories section and you could put the preamp on the lower shelf.)

Though most of my gear isn't Naim, that's what I've done with my turntable PSU and Border Patrol PSU as well as the 01's power box.

Good luck!