I agree with the above comments on the lumber rack. That and I don't think it is big enough. I built a "huge" lumber rack in my shop. I now have that, a bunch of stuff stored vertically, a shelving unit for shorts about 2' long, and a rolling cart for longer shorts (~3-5') All are full because of deals I've gotten on lumber. One thing you could consider is extending the roof behind the DC room to create a sheltered lumber storage area for long term storage.
Like someone else said, I'd put the drill press closer to the assembly area. Maybe think about switching the grinder and bandsaw with the drill press and mortiser because. That will let you do your rough work on the bottom of the shop and the joinery/assembly at the top. You also might want to think about a rolling cart for your WIP. I found moving from a small garage shop to a larger dedicated shop that one was helpful to have a place to set stuff down.