Post form will not last,even if you seal it with marine varnish and it`s also a very light top
A pine carcass and a saligna top is a cheap alternative,Top can even be pine with a 20mm Saligna veneer,
My 3m x 600mm bench,2m x 600mm bench and 2m x 900mm benches are not enough,
Also check 'your own' ideal work height before you build and add 50mm on that height on the legs,which can always be cut/planed off
I am busy with a 10,5m x 600mm design ,Hopefully my staff will stop complaining about space.

My main bench weighs 150kg,It`s too light,it moves sometimes.
I work a average of 30 hours a week @ my benches,and
I think that a perfect bench is more important than expensive tools,with a good bench your work feels much less
and finally get a good thick offcut carpet in front of the bench
