I was so pleased by my experiment with a boxed portable wargame that I decided to expand upon it with additional terrain boards.
Here is the result - space, desert, and sea:
The boards consist of scrapbooking paper glued to stiff 8" x 10" artist board. I chose paper because I figured it would be thinner than felt and therefore allow for more stuff in the box. I played a test game with a road cut from some paper. It tended to slide, a problem I didn't have with my felt boards. I'm thinking of switching to felt (although laziness may postpone this idea for a while).
The space and sea boards are divided into an offset square grid, which I think will work better for ship maneuvering.
My plan is to get a Tuff Box for each board. I'll fill the box with everything needed to play a game. In addition to the board there will be dice, terrain (as applicable), a copy of the rules, and two opposed miniature armies. My ship and spaceship miniatures are too large for these grids so I will need to turn to smaller alternatives.
Anyway, I'll post my account of my latest experiment - the next battle in my Zirconian sci-fi campaign.