Whatever your plan ends up, Be sure to have a roll-around. At work these are 30"to 36"wide x 48" x 32" high tables on industrial strength casters 4" or larger 300# load each.Some of them have locking casters. These tables are made from 4"x4" and two by four's and are bolted together after deck screws are used for rough assembly
They have a 1" thick shelf about 8" above the floor, and two of the casters at the handle end swivel. The top is of 1" particle board with FORMICA the bearers of the top are extended about 8" to allow a dowel to be placed through them as a push handle. There is no set plan, and we have other sizes. Mine also has a vise on the side. ( I often do machine repair and it is very handy.) The sky is the limit, and what ever you build will get the tool box, incoming plate and material, parts, or whatever from where they are to where they are needed. Good portable work bench too!
To know by reading is different than knowing by doing. OR:
What you have going into a situation is knowlege..What you have coming out of that situation (providing you survive!) is wisdom.