Just a few random comments. I'm assuming that you are not building the storage hutch on the back. My first overall impression is that unless you really enjoy making benches, the plan is way too complicated for what the intended purpose is.
If you are standing on the right side the bench is 4 feet deep which in my mind will end up being a place where clutter lives. If it were me I would make a simple 4' long shelf that is about 20" deep. I would mount my tools (press, vise, so forth) on thick plywood bases, then devise a quick mounting system using rails or threaded inserts and swap out tools as needed.
It is true that you are maximizing leading edge surfaces but those surfaces are in my opinion a bit on the small side. The 18" on the left side is not much room. Perhaps you should make a cardboard mock up of the bench top and see if you can actually work at the bench. If you want to keep the L shape of the bench consider making it about half as deep as the plan currently calls for.
Most firearms related forums have in the reloading section (this one is no exception) a thread dedicated to members showing off their benches. The one on this forum is not a sticky and not as well populated as others. If your not aware of this then I encourage you to look for them as there are a great resource for ideas. If I may suggest this, the reloading section of the 1911 forum has one of the biggest threads of pictures showing benches that I know of. Lots of ideas there.