This was a ton of fun! First time doing a bag nearly this complicated (I've never even made one with the gusset before), so a huge learning curve, but I think it turned out really well!
Like a lot of people, I don't have a leather sewing machine, so I ended up doing the whole thing with a saddle stitch, so it took me a few weeks to do, though I'm guessing it'll go significantly quicker for the second one.
For those who are curious, it was made out of Wicket & Craig utility grade carving lea...