I got rid of all the n-gons and I think this concludes the modeling phase.
Thanks to Dalboris's
Giraffe tutorial (merci Dalboris), I was able to make a UV map, using Hexagon's UV unwrap tool. I had to restart it 4 or 5 times because of the bugs and operator errors, but I got there.
I tried displacement painting in both Hex and C6, and it was agonizingly slow. So I decided to use a simple bump map instead. Here's a quick test render. I definitely have to rework the bump map and I'll probably lighten the bumps on the trunk.
Eric