Here is an early pic of my bench, it's about 5 feet long and was initially set up for shotshell reloading (you can see the MEC on the right side) but subsequently I added a metallic area.
The top is made of 2x6's on edge and covered with a galvanized sheet metal top. 4x4 legs with a shelf about 10" off of the floor to keep reloading, gun cases, ammo boxes and stuff on.
It's made of 2x4's covered with 3/4" plywood. A very sturdy bench.
I installed two stainless steel tubes, about 12" long x 1" diameter, just below the benchtop which accept the slightly smaller tubes mounted on the MEC loader. (You can see the tubes at the base of the MEC.) It works rather well and keeps my benchtop available for smithing and such without the clutter. I simply switch the tubes mounted on the loader to another with wingnuts and away I go!
The large grey cabinet houses 4 MEC loaders and sizers, the white cabinets house primers, loading tools, powder and such. (The primers and powder are up high and in separate cabinets to avoid any low flying sparks.)
I really need to take another pic as the bench has progressed so you can see how it functions better.
Oh, the thing hanging overhead is a shot hopper that I made to hold 75# of lead shot, which I use a small hose connector to feed the shot bottle with. I saves the hassle of trying to feed shot bags up high and losing shot. It's on an overhead pulley that is in the rafters so all I do is lower it to the floor and pour the lead in..........works fantastic!