Finally I have a surface to play on...almost...

[Doomsdave]

@dave...I have considered this solution...do you fasten the MDF to the folding tables some how or just tell everyone to be careful?

Cheers,

Blue

Yes.  You can use washers and bolts with wingnuts.  Carefully drill holes through the MDF and the table (so they line up) and slip bolts through washers/mdf/table, then fasten with wignuts.  Strategically placed hollow scenery or objectives cover the bolt heads on the surface (or you can go with countersunk fasteners depending on thickness of mdf).  If you get the 6' table then a 6'X4' board only overlaps on the long sides and presents little problem.  The nice part is you can get the roll-up terrain mats and throw-em out on your fold-up tables in any room of the house and it all goes back in the closet in just a few minutes.  This prevents divorces caused by monolithic immovable tables and dedicated gaming rooms.  

[Mason]

The other alternative, which I have used on my gaming board, is to just glue and screw some lengths of wood to the bottom of the MDF.
Just lay the board on the floor, flip the table over and mark the outline of the table on the MDF.
Then you can fix some lengths of wood to the bottom and the board does not move.

I did this and left a small gap so that I can put a cloth on my kitchen table first to protect it and put the board down on this.
It also makes for a tighter fit.

[Blue in vt]

Nice guys! thanks for the info...some day when I'm flush and have more time I'll follow up on these ideas!

Blue

[Doomsdave]

The other alternative, which I have used on my gaming board, is to just glue and screw some lengths of wood to the bottom of the MDF.
Just lay the board on the floor, flip the table over and mark the outline of the table on the MDF.
Then you can fix some lengths of wood to the bottom and the board does not move.

I did this and left a small gap so that I can put a cloth on my kitchen table first to protect it and put the board down on this.
It also makes for a tighter fit.

Great idea.  I'm going to try this next for our dining room table.  Thanks.