Not reinventing the wheel here but here is mine so far.
I used a trash can I got from Wal-Mart it was like 18 bux and change. I also like this one the best because it had the squarest body and the smallest hump. It easily fits 3 kegs and my co2 bottle or 4 kegs if the bottle sits outside.
I used a heating vent that I connected to a paint tray to make a drip tray.
It can be attached and removed with some L brackets I attached.
Used a brass hose end with a cover I found at Lowes as a drain it attaches to the can by a threaded PVC piece that screws onto it that sandwiches the can between the two pieces.
I didn't bother insulating the can I will set the can in a water heater tray to catch any condensation from the can.
I built a wooden platform to even out the floor with the hump. It's not connected and after use I will drain the water and pull the platform out to let it dry.
I plan on making a PVC sleeve to hold the co2 bottle that can be attached inside or out.
Still got to stain the wood and install faucets and hoses. I will post more pics when I finish it up.