Looking good. I'm not sure I would ever endeavor to attempt something like this, so I would never criticize anyone else's welding as I have never done it myself.
Curious where you got the propane tank, and how did you ensure it was completely empty before applying welds to it?
The tank had the fittings removed and was in the atmosphere for 2 years. There was no gas left n the cylinder. Even the mercaptan smell was gone.
I got the tank from a private seller.
JC