I dont think the 1" pine by itself would be strong enough unless you supported it with a framework of some kind . the laminated joints would be the strongest point because pine is a softwood .
On my bench I used two layer of particle board laminated together with a 2x12 particle board laminated beam under it in the front and a solid sheet of obs at the back of the bench .Then I covered the whole thing with formica and a oak trim on the face of the double laminate top .Total cost was something like $40.00 . I designed it myself . All it required is two sheets of 3/4" particle board ,one sheet of 1/2" obs and a damaged sheet of formica I got for 5 bucks some glue and screws . I have built three more for friends since then .