Took me one evening to put together a kegerator for my motor coach after finding a very unique cooling kit designed for sailboats that is rugged and will run in corrosive and non level environments.
This little unit can be put into the side of any yeti type cooler on the market that meets your width and height needs and make a really good kegerator. I have a 46 foot Newel motorcoach with a 29 inch restriction on the height of the storage bays and I wanted to put a 1/6 keg unde the coach standing vertically. Found a good ice chest on amazon that just fit a 1/6 keg with a low profile tap on the top.
I bought all the other supplies off amazon, stainless steel parts, intertap dispenser, drip tray etc and put it all together and I have a very nice 12 volt/120 volt kegerator that is very small in size and fits under my motorcoach vertically and will chill the beer to 32 degrees if I want. The battery usage is very small. Takes about 10 days to discharge half of a normal 12 volt deep cell battery but this is not a problem for a coach with (6) 8D truck batteries. ( more than 60 days). Compressor is super energy efficient and runs less than 5 minutes every couple hours to keep the keg chilled. The cooler used is already super insulated and designed to hold ice for 5 days. This type of compressor recirculates cold air with a built in fan so not like a cooling plate system that is slower to cool down the contents. Since there is not cooling plate to install this unit just slips right into the back of any cooler by cutting one hole and screwing it into the wall of the cooler.
This is not a small budget item to build but it is very unique and very portable and can take any where. The compressor is very small and light weight. Approximately $700 for the cooling kit $150 for the two way power conversion box to go with the compressor unit and $200 for the cooler.
The items listed below were the major items purchased. The other items used are the usual items you use for making a kegerator.
Outsunny 64 Quart Heavy Duty Roto-Molded Cooler / Ice Box
https://www.defender.com/product.jsp?id=323775
Dometic CS-NC-15 CoolMatic Cooling Kit