I finally got my loading bench the way I want it. And it only took about 40 years. I made my own bench in an isolated corner of my finished basement. On the long end the bench measures 6' long and 2' deep, the short part of the L is 4' long. My press sets on the end of the short side. My powder thrower is about a foot off the corner on the opposite leg. This gives me about 4' to place my scale, loading block, etc. to charge the cases.
I have a shelf about 12" above the bench and a 30" and 36" wall cabinets above that which hold my powder, bullets, manuals etc.
However, the layout is a personal preference by the individual. I am left handed so what works for me may be different for you.