You don't need no stinkin' desk.
I used to model on a desk, until my two kids came along. I now model on the kitchen table. I use a small tool box to hold all of my tools. I have a board that I model on to keep the table clean. The real plus of modeling this way is that the tools, glue, etc can be kept out of reach of the little ones. On my kitchen table, I've built a 1/350 USS Arizona, a 1/35th K5 Leopold (Anzio Annie), and Tamiya's M26 Dragon Wagon with trailer and many others. I do my airbrushing downstairs in a spray booth that folds up when not in use. The biggest pain with modelling on the kitchen table is setting up to work and cleaning up afterwards. It adds about 10 minutes of extra work but well worth it. My wife is always surprised how many tools I can fit in my little tool box and how well organized it is. Basically, my whole modeling space is about 2.5' by 1.5'. Not bad if you ask me.
Here's some pics (all of the models were built on my kitchen table):