You need a workspace for your 3d printer and sometimes this space needs to be mobile. Here are two projects with detailed construction guides.
Oahu Makerspace documented construction guide for this "chuck box" or "field desk" type workstation. It is constructed from cut plywood.
Detailed construction guide, measures and Sketchup files. You can make it by hand or by CNC.
Dave Akkermans classroom 3d printer cart. Dave made it for his classroom bat you can use it in your home workshop. It is based on cheap cleaning car.