This shouldn't look too different from a lot of the electric PID based brew rigs on this site, let alone my own.
Steel 55Gal Drum
120V 15A input to work on nearly any household outlet.
Dual PID feeding control to a 25Amp SSR. (second PID used as alarm-limiting relay)
Dual PT100 RTD Temperature probes
Output to a single 1000W Electric coil burner with heat-fuse and thermostat bypass
6 qt cast iron pot for heat retention and woodchip holder
Two layers of Reflectix insulation: Single 25ftx24" roll.
Two 22" grill grates with stainless steel mounting hardware
Custom caster platform for easy maneuvering from storage to cooking location
I got the rig up to about 190 Degrees F before I put on the Reflectix Insulation, after that: hits 225 F in less than 12 mins (my favorite pork shoulder temp, have gotten over 250 when testing). Hold temperatures, with +/- 0.5 degree accuracy, indefinitely.
Have smoked 5-6 full shoulders, 4-6 racks of ribs, more sausage than you can stuff a snout with, peppers, corn, and other tasty items, all with simply perfect results.
I have a Bill of Materials if you are interested. All told, it costs about $238.15... give-r-take what you have lying around the house.