Ken and David, thanks for your feedback!

I do have a workbench book from Chris Schwarz. I'll pull it out again for another read to see if there are any things that can help me out.

I had considered the idea of a split top. I definitely like the extra clamping options it brings. How wide of a split between slabs would be ideal? Splitting up the top like that would definitely make it easier to disassemble in the future. And I've wanted to try the double through-tenon/dovetail that is typical of many benches. So, that could be a fun way to accomplish both goals.