i've been thinking, i think this is alot easier:
you have to create a way to export an image to a .jpg file in flatmode
this map has to be at real size, if 1 tile is 1x1 cm, the real map of 192x192 will become 192x192 cm.
the user will be able to enter a map, and will become the tables background.
some things it needs:
a white line between each tile of 1 px. this will help people placing buildings.
than i will make sure the table will work (probably with an automated program, im not gonna make 192x192 cells in a table )
the link (its in dutch but i think youll get the point)