[Special thanks to Dave Riendeau (@dave) who suggested to use clamping cauls: this method has really made the difference for me!
I simply used soft wax to create a layer between the surfaces of the bench top and the face of the pieces used for clamping.]
[I’ve used two cheap L-shaped aluminium moulding to check the surface]
Nice work Emilio. Your top looks very clean and flat. The wood you are using looks fairly clear – or at least the knots are very small and sparse. Dimensional lumber where I live usually has big knots that are hard to avoid.