This is something DBlue135 and I built this summer for the XtremeSystems Autocascade Competition.

We used a 1/2 hp rotary compressor, R22, a fairly standard condenser, a home-built water-cooled condenser/phase seperator, etc.

Both stages return through a slhx to help the second stage condense.

The first thing we did was build the main heat exchanger.



Then we made the coils for our water-cooled condenser. These are 3/8" copper pipe and DBlue tells me it was not very fun to bend these:



We then put the coils together and added their inlet:



Then came the first version of our main seperator, which looked like this:



We decided the volume was too low so we rebuilt it. We also constructed the housing for the water-cooled section:



We picked up a cheap base board and gave a it a coat of blue spray paint. It's big enough that we don't have to be too careful with our layout, there's a lot of space. We mounted the board on casters and mounted the first few components to the board:





And we mounted our water cooled condenser and base to the board.