I use our dining table at the moment too, much to the Admiral's disdain. I bought a 3 drawer tool box from Lowe's and set it on a 18x24 cutting mat on top of the table. the mat protects the table from the box and enough of it protrudes to give me enough room for most tasks. I keep the model I'm working on either in the kit box or a cardboard box that I can stash when needed. Unfortunately, I have no room for a paint booth so I have to do that outside.
I was looking for a pic of a rolling airbrush/make up station that would work well for you and I came across a blog plugging some insane storage boxes...
www.modelmaq.es/index.php
I can't speak Spanish so I have no idea what it says about them but my eyes can see in any language and they like the heck out of these.