I like them all separate, so I can move them around when I need/want. It depends on your work area and how much space you have. I used the biggest bolts that would fit in the holes of my presses. For Lee press, I think that may be 5/16 bolts, maybe 3/8, I don't remember. For the press itself, I'd lean more towards the 2x material, 2x6, 2x8, whatever. You'll want to countersink or counterbore the holes on the bottom side. Not sure 3/4 ply will be quite hefty enough. Some may use it... I don't know.