Not fancy and not clean and I'm after one thing when I cast production at a high rate!!!!!!!!!
With the exception of when I cast for my 45/70, I use multiple molds all hopefully of 4 or more cavities.
With the original poster's idea of one pot over another, that is the only way a bottom pour might keep up with my old open pot system.
A 40 - 45lb. pot over an old Coleman gas stove flat out gets er done and does so at the rate/volume of production I require.
When casting by myself and not for the 45/70 where I use a single 4 cavity 465gr mold, I will be running up to three molds and if I happen to be casting with a partner will up the number of molds to 4.
Once the molds are all up to temp, it is almost a none stop process with only short breaks to flux/skim the pot and add back the sprues and fresh ingots.
With this size pot and plenty of heat, I seldom need to stop casting and only then if I allowed the pot to get too low before adding more ingots.
May not be neat, but it is what it is, a system which allows me to cast a lot of bullets in a 2 - 3 hour casting session.
Crusty Deary Ol'Coot