Navin is just about perfect for my needs. Like so many other have said, thanks to all of you.
My question is whether to make tweaks as necessary in the Navin theme or whether to sub-theme Navin and to make changes in my sub-theme. Or I guess I could try to just "clone" Navin. I tried to sub-theme Navin using "base theme = 'navin'" and wound up with no CSS styling at all. Before I dig too deep in how to make it work, I'm just asking for your best practice on how to go forward with my implementation and tweaking of Navin.