Amek Einstein PSU

HI! im attempting to build a PSU for an Amek Einstein console from scratch, well from this scratch:

i believe this is the original circuit for the PSU. looks fine. im drawing it on ISIS (proteus) to make the PCB. the idea is to mount the TO-3 transistors and the large caps off the board.

i found a local toroidal transformer supplier, they build very nice trainnis, but im a little confused about the best transformer ratings for this project, any suggestions and ideas would be very welcome....