Off the top of my head.
Pid temperature controller
25 amp ssr
Aluminum heatsink for ssr
Project box
K-type thermocouple (not waterproof for sous vide)
3 prong socket for a standard pc cord.
Pc cord
Standard 20 amp outlet
Wire, terminals, etc..
Thermal paste between heat sink and ssr (although for the current use, i doubt the ssr will need a heat sink or the thermal paste, but planning for future applications)
To make it useful for more than one job, I'm going to add a jack to plug in my temp probes instead of having it wired directly to the pid (waterproof probe for sous vide, etc.)
For the blower/stoker. An old laptop cpu cooling fan, old tv channel box, flex tubing, small metal dog water bowl, 2 toggle bolts to hold the dog bowl onto one of the vents, duct foil tape to cover the other bottom vents, an old cell phone charger that matches the voltage specs for the cpu fan (and the amps are close enough), tape, wire connectors, box filler, etc..
For anything larger than a weber grill (drum smoker, etc), you'll prob need a more powerful fan than the small cpu fan I'm using.