The custom is looking more and more dialed all the time. I find the nearly straight-back sweep to be too much ergonomically as well. Funny enough I find it works OK in a more aggressive position (like, level with the saddle) but if your arms are forward instead of down towards your hips, it puts the wrist at a strange angle - one fix is to angle them downwards quite a bit, which seems to work for a lot of folks. I like my sweep around the 45 to 60 degree range, I think Billies would feel good to me on the upper end.
I really want a Faceplater stem for the Bombadil.