You are rolling right along on your projects!
The uneven white paint on t posts bothers me too. At my local TSC they sell spray paint for metal applications in “farm colors”. The green looks to be an excellent match for t posts. I’ve considered spraying my own posts but I’m not terribly motivated atm
As an aside, my Dad has a post pounder that has its own motor. Like a man auger but for pounding posts. It’s crazy heavy though. He only uses it on bigger jobs bc they either move it with the skid steer or two strong men. We didn’t bother w it at my little farm. We set the wood posts in concrete and hand pounded the t posts.
Can you remind me of the dimensions of your tack room? And your plan for feed storage? I’m still scheming on my own barn space and am thinking I might need separate feed and tack rooms instead of my OG plan of a larger tack room and a feed box.