[manymatter]

I worked in such a ghost kitchen in the 1990s (we didn't have a license to sell food on premises.)

You want a gas conveyor oven which actually takes a lot of space and needs ~3 meters in front for assembly and 2 meters behind it. Walk in fridge and freezer are at least another shipping container in size. Then there's clean up and other prep space..

For us, wages were more than rent and probably our competitors rents. 2/3rds of wages would be drivers at slow times going to something like 4/5ths during the Superbowl.