Finally finished my winter project this weekend on building my first UDS. Made a fair few mistakes along the way (e.g. buying galvanised steel mesh for the charcoal basket), and getting the inner lining out was an effort, but hoping it will pay off with some great BBQ.
Have been seasoning it this afternoon, will probably have to wait until next week to try cooking anything. First impressions seem pretty good -- has been holding at around 200-250F for about 5 hours now after some initial spikes in temp, with minimal temperature control. Don't quite know what to do with the valves for now, but hoping will come with practice.
General set up is a 55 gallon drum, charcoal basket, two shelves (lower used with pizza pan as heat diffuser), side shelf for Maverisk and tools, three air vents near bottom (one ball valve, two with caps), and a slightly ill-fitting lid with exhaust holes and handle. All in, probably cost about £100 and quite a few hours. Attached a few pics.
Would be scouring the forum for advice on how to keep temperature, useful modifications (e.g. is it worth drilling another hold for the Maverick probes?) and charcoal set up. Should be a fun summer.