here is what I used to build mine .It is 3x3x6ft
http://www.auberins.com/index.php?main_page=product_info&cPath=1&product
1/16 DIN PID Temperature Controller (Relay Output)
$44.50 This is a dual display, 1/16 DIN size (1.89x1.89" or 48 x 48 mm) temperature/process controller. Common applications of this controller include controlling the temperature of industrial equipment, laboratory equipments, espresso machine, beer brewing system, BBQ grill and smoker, heat treatment oven, glass kiln, and aquarium.
K Type Thermocouple w/ alligator clip tip.
$10.95
K type thermocouple with an alligator clip on the tip. This sensor has small thermal mass for fast response in the air. It can be used for barbeque smoker, powder coating oven and refrigerator applications. User can clip it on the oven rack or on the parts.
Maximum working temperature: 300C (550F).
Cable: 6 ft (2 meters) long, Insulation: TEFLON (PFA) with stainless steel over braid. Terminated with thermocouple mini connector.
40 Amp SSR
$19.00 or a Contactor, 2 pole 40 A, 240V coil
$17.99
wool from mc masters-car
trolleys
http://www.mcmaster.com/#strut-channel-trolleys/=99w0h5
metel from sheetmetel shop
burners from geebros
H44X5099-454811 Emerson Appliance Solution Ch44x5099-454811 Range Oven Element 2700 watts $9.99 per burner
and check with some one to wire