Whatever you build make it bigger then you need, trust me you will need the room soon. I went from a 2 foot bench to a 6 foot bench, and now my 6 foot bench has a RCBS Rockchucker, RCBS Pro 2000 and two MEC presses, 10 Gauge and 410 Progressive all fighting for space, not to mention trimmer, case prep center, scales, measures.... Trust me, make it BIG.