On Oct 17, 9:38 pm, Chris wrote:
Over the years I have built a number of table tops to go over existing
tables to make them larger.

Construction has usually been discs of MDF or Chipboard ( often made
in pieces for ease of handling ) that just sit on the existing table.
Its covered by a cloth so looks are not important . This is standard
practice in restaurants.

I now have to make another for my daughter and I wonder if there is a
better lighter material.

I have made plenty of 2000x1000mm table tops from 7mm 3-ply, with
40x20 mm timber edging glued on (with the 40mm vertical). They are
very light and seem to be strong enough to put on trestles. I can
usually find ply sheets with damaged edges at 30% of the normal price
and cut the edges off.