Now on my 7th or 8th different bench .... (moved from house to house & place to place over the last 40 years - the benches were often left inplace) . Work with the Rock-Chucker on your right, handle on your right ... if you're right handed.
Ideally, the bench should be rock solid, and I've bolted my most recent to the wall & the floor. Having tried both, I prefer to sit at a stool that allows you to put your legs under the bench, with a foot support. I can (and do) stay at the bench for hours sometimes. Mine is built out of 2x4's & 4x4's with a 1" plywood top, sanded smooth, stained (pine) and finished in Urethane. Built-in type shelf at the back of the bench (within easy arms reach) for the powder scale and trickler at eye-level. "Working" bullets, powder and primers are out and on the shelf, otherwise, all non-working supplies ( i.e. for other loads, calibers, etc) are safely stored in nearby cupboards - elsewhere. My powder measure is pretty much dead-centre on the bench just in front of and below the scale shelf, and the rotary case trimmer is to the left side, also securely bolted to the bench. The powder measure is on a stand, and is high enough to get Hodgdon's 1 lb cans under the drop tube ( to empty the measure without taking it down... just cycle the handle )
I built the bench top much like a framed wall, with 2x4 crossers spaced so that the press bolts ran right through the crossers edgeways. Used, as I recall, 5" x 3/8" bolts to secure the press, and counter sunk all the screws holding the top down for a flush fit.
Fairly simple ... and works for me.
Not handy with carpentry ... find someone who is ... and pay/bribe them well to do the job properly.