Great looking units! You inspired me to set up a template in Polyboard to create some similar units. For anyone that uses Polyboard for cabinet design, I've setup a manufacturing method and sub-methods for 18mm birch ply, with 6x40 Domino fixings, 18mm MR MDF tops, with single panel pattern for MFT holes, and drilling pattern for SYS-AZ drawers. Using that manufacturing setup I created a single cabinet, double cabinet, Kapex unit, and XCarve 1000mm cabinet, all with 900mm worktop height and 100mm plinth height so you can use 100mm locking castors and make them into carts.
Once I've measured up my CMS unit I'll design a cart for that (to use with its legs folded away) and add SYS-AZ / CMS insert storage below it.
I really like your rail and material storage so I'll create some rear cabinets to mimic those too.
I'm happy to share the cabinet files if anyone's interested.
Chris