I built my reloading bench from salvaged materials.
the ends of 4x6 sign posts for legs and replaced signs for shelving and top.
The shelves and top are therefor made from 3/4 marine grade Crezon.
The top is two layers so it is 1 1/2 inches thick.
I don't know what it weighs but it is very heavy. I can lift one end, but just barely. My guess would be overall weight at around 300 lb, bare.
It's not fancy, but it is rock solid and should last my lifetime and then some.