[franken]

No pics. I don't have a pic hosting site account and they're too big to post. You can PM an email address and I can send the dinosaur way tho.
I have a custom (not fancy or expensive) true 3/4" flex line from the tank to the ceiling. That means the ID of the fittings is 3/4". Then 20' pipe with a minimal drop with a union. The same back and forth until I drop into the last horizontal end with another union where I have the filter, dryer, regulator and multiple air outlets. Simple cheap effective.
Auto-drains tend to clog so you have to check; same as manually cracking a ball valve. Barf. I run a L of the bottom of the tank out to the edge, then valve, then reverse back a bit and down. Ok, I'm cheap and lazy.
You just need to crack the valve to drain the water at the bottom of the tank. I used to superstitiously drain the air from the tank but eventually realized that wasn't needed. Sort of like using flare wrenches on bleeder screws. Lol