Nice looking space

My free advice for moisture control is some large fans set on lowest speed which run 24x7.
Also I would recommend covering the exposed framing under the lean-to/porch. Some kind of bird will eventually discover this roofed bird-mecca and begin nesting and soiling whatever valuable things are parked underneath. Closing it off to exclude them would be a high priority for me, personally.
Did you do any "stubs" in your foundation/floor for electrical? Are you going to sub-panel from your house or will you have a new service brought to it?