I was going to build the cabinet myself but after some research and looking for steel I decided I would be money and time ahead to just find a cabinet that would work. Here is a parts list of what I used to build my oven.
PID controller with thermocouple and ssr
Electric oven element
Stack-On® 21" Buck Commander Bow and Gear Storage Cabinet
1- 4x8 sheet of 5/8 drywall I needed more to do door but at this point it is working fine without it on the door.
Electrical junction box
15 amp standard light switch
220 oven/drier cord
Misc bolts and hardware.
I started out taking all the stuff out of the cabinet. I located where I was going to put the element. I cut the hole in the cabinet for the element to protrude.
After the first run I rechecked why my first wire diagram didn't work and found out when I wired my breaker box in the garage I forgot to tie both ground rails together so when I used the center wire for my common wire it wasn't connected to the common rail. I rewired my breaker box correctly by installing the jumper wire from rail to rail and then wired it as I had the first time and now it works fine and I don't need the extra 110 cord to power the box
here is my box and here is a couple of different wire diagrams to give an idea how to wire.