Ok, here is the quick run down. I will try to add photos of the steps:
First is to purchase your paint. I used flat camouflage black and tan for this repaint, purchased at my friendly neighborhood Napa auto parts store.
I did all painting outside on a warm non windy day.
Remove the roof and ladder. I painted these black and left them to dry.
Next remove the interior screws of the tank to wood structure base and remove the lower tank pipe.
Take a standard screw driver and gently pry off the front pipe and chain details that are pre attached to the frame and press fit onto the tank. These come off easier if you work around in stages
I removed the gray Pedestals on the bottom of the wood support structure. They are screwed in with small Phillips screws
Next Paint the wood structure and Tank with the light Tan camouflage paint, let dry for a couple of hours, Make sure you get good coverage on those shiny copper bands.
Next I used burnt umber and mars black acrylic artist paints and used a brush and painted the legs. brush strokes are good here so don't worry about them, it will build up a wood grain look.
Don't worry about full coverage, if the light tan is visible this will add to the realism.
Next take the tank and use the same paint but with more of a wash mix and paint up and down on the tank, dry brush techniques work well here too, go slow, work multiple applications with thin washes as well.
Next take the spout and chain assembly, Paint the chain, spout, pulleys, and dry brush the wood frame with grimey black paint
let dry, and apply again if needed, don't forget the counter weights.
Paint the bottom tank pipe as well.
Let dry over night
Paint all the pedestal feet with aged concrete paint.
Let them dry
Now the hard part. use a fine tip brush and paint the rings of the tank in grimey black, have another brush ready with water incase you mess up. The brush with the water will immediately wash the grimey black into the tank boards and you can continue to paint the wire bands.
The above took some time and patience.
Next reassemble everything. Apply chalks (dark brown and rust colors to the spout, chain and pivots) Add lighter chalks to the wood structure, add rust chalks to the bands on the tank using the dry brush technique.
I will post some pictures