Good stuff. I'd be careful with the birch - they're very susceptible to fungal attack, and the mushroom growing in the pot suggests conditions are favourable for that. Consider spraying with fungicide perhaps.
Very 'green' thinking there.
A while back I started to make a small deadwood planting with Birch Polypore (the bracket fungus), to use as an accent. Then I realised that as I was also trying to grow birch bonsai, it probably wasn't a good idea to be introducing a species that was definitely problematic into the garden...
I'm going to focus on quality over quantity so I am paring down my tree count. Here are two that I just potted up yesterday for my mother. They're Ilex crenata 'Dwarf Pagoda' and Shimpaku juniper. The holly has been receiving clip and grow techniques for three growing seasons and the juniper received a little wiring last year (it needs a lot more).
Nice group of trees. Most of them look like cut down gallons of assorted varieties. Thats good, BUT...one piece of advice...if you were my student and I've had many, I would learn you quick the art of cutting back harder. I know your in Oregon and stuff does not always grow super speedy, but no sense wasting the time watching it grow only to say "self, why didn't you cut that back harder in the first place".