Not at all, I used mine because it is well thought out and, for a prototype, professionally done.
I, as an Electronics Engineer, have every right to have opinions on this, You might be advised to listen.
Would you like links to all to good designs built by members of this board?
There are many, the search function would have found them for you.
see 'The Professor's' dual design.
You, as an after thought (cough cough) realized, your upright PID would get ruined by lead, patch
It was pointed out the heat generated would be bad for the SSR when in the casing, patch. So you added an exposed to the lead/fingers/what ever it might hit. What happens when someone reaches around back? electric shock.
You 'decided' on a fuse, patch. even if you have no idea of what type of fuse(s) would be good.
Oh and BTW, that AL case is going to get mighty hot being in contact with the upright on the pot. You did provide a way to vent the heat build up on the inside,didn't you? The best way would be to use standoffs and get it off the heat source. But a few air flow vents May be marginally adequate. Just because it's AL doesn't mean it stays cool, AL heats up just as fast as it cools down.