Looks like you have more room than I have David. I have to do all my washing in the kitchen sink. You can get by with four trays of each size. Two for developers or developer/water bath, one for the stop, and one for the first fx. Keeping the prints in a tub of water, I dump and rinse the trays, then cylce through the second fix, toning, and HCA.
You've got a print washer which is good. I use a couple Rubber Maid dishwashing tubs and the soak/rinse process for washing.