Talking to Ross Seyfried years ago he gave me the basic idea.
It’s a 18” OD steel pipe 18” long.
Cut in half lengthwise.
1/4” end plates welded in and 2”x2” angle legs.
Originally I used a 6”OD x 4” high dipper to pour ingots.
What a job, 40lbs or more a pour.
Then I read on the other site about a bottom pour valve.
A tapped rod with taper machined in welded under, matching tapered screw/bolt welded to handle.
Eventually I added scrap plate to 3 sides to contain heat.
Then 4” sideboards for more capacity.
500,000 btu weed burner Red Dragon torch.
When W-WTS were zinc less I could get 5 gal ready to skim in 30 min.
Steel for pot is safer than cast iron as there is a possibly of cracking.
You wouldn’t want 1000lbs dumped all of the sudden.
The pot could be scaled up some for larger melts.
I’d make the ingot molds out of 1/8” instead of 1/4” 2x2 angle.