Here is the mount I made.

I made our tabletop using 3/4' birch plywood cut to size and finished with 3 coats of tabletop varnish.  It has served us well for over 4 years. if it ever needed it, it would be easy to sand it and add more coats of finish. it is much larger than your size, but the process is the same.

 I roughly measured the table size on the blank plywood.  Then I added 2" painter's tape to both sides of the plywood where the cuts would be. then I carefully measured the exact size and shape that I wanted onto the taped plywood. make sure all marks on the tape on both sides.The tape will keep all edges smooth when you use your jig saw to make the cuts. the best jig saw blade for this  is a down cut, flush cut high tooth per inch blade.After you cut, remove the tape, sand the edges and top and began applying finish.  I used Woodwoker's Supply Tabletop Varnish.  I have used it before and it makes a smooth, durable finish.  You can brush it over bare wood or stained wood.  I used 3 coats and steel wool between coats.

  actually, after we made it and used it a couple of times, we decided to change the size-we made it narrower and shorter and increased the radius of the corners. We did the same process with tape, cut and finish the edges.

Travel Safe 

Vann

Many thanks!