Quote Originally Posted by m0nk33y
good luck tuning it to get the c02 to condense
The co2 would not condense in the condenser right after the compressor discharge. It would condense in the heat exchanger later on.

The diagram looks fine to me but you would also need a filter drier in the liquid co2 line or right after the compressor discharge where it can filter it all. It would also be good to put a high pressure cutoff between the high and low sides (where their gas) set to open if pressure reaches > 400psi. That will protect you from a rupture.