Copper Pipe air dryer

[rbruno68]

I am finishing up wiring for my compressor and my next upgrade in my garage is making a copper pipe air dryer to be able to paint the cab and have drier air for my power tools. I have notice in some of the pictures people post that they have air dryers/manifolds, so I thought I would ask some advice on the design. I have a 3/4 rubber air hose already on my compressor and plan to use 3/4 inch copper pipe.

1. How much total length of the manifold do I need to cool the air?
2. Did you put a regulator BEFORE the manifold where the compressor attaches or just at points where hoses would plug in. Or both?
3. Are 1/2 inch regulators/filters large enough for enough air flow to use a paint gun. I don't plan to be a professional painter, but would like to do a decent job on the truck and other projects. Not sure if I need a 3/4 inch regulator and filters for the best flow.
4. Who makes decent regulators and filters? Again, I won't be opening a paint shop so I don't want to buy the Cadillac of filters/regulators, but I also don't want something that is going to break/fall apart with minimal use.
4. Any other design recommendations?

Thanks for any advice.
Rob