I've ordered a 4U rack mount kit with DIN rail for mounting the Acromag stuff. It's open on the top and bottom but is quite deep. I've made up a front panel for this kit which will connect to the slow controls with 8 analog inputs, 8 analog outputs, 4 binary inputs/outputs, 2x 25 pin connectors for connecting to the FSS boards and a 15 pin connector for connecting to the ion pump current supply.