The main board does not need to be assembled but the regulator modules do (2 per power supply).
For the Power supply modules, using the LT1236 should reduce the heat on the CCS pad feeding the reference by about 5 deg C.
I haven't tested this yet, but it seems like a good substitute and possibly preferable.
PS - Just thinking out loud, the LT1021-7 might be the best option here.