Silk farming in cupboards is a bit awkward , the practice irl is done using huge circular twig frames or square that are placed on top of each other with leaves and rotated based on the size of the worms : https://en.wikipedia.org/wiki/Sericulture
Just allow us to build the twig frames which would be thought out specifically for the worms with their perfect slots for leaves for each batch.
Currently each worm batch is 22 leaves and 42 worms per cupboard , allow us to put the same exact batch in said frames or even better allow us to add 44 leaves and 84 worms in order to take up less space in a silk house and make it a bit more comfortable to work as a activity.
http://rcscollegemanjhaul.org/rcs/asset ... 39-sms.pdf
Plenty of examples can be found in multiple cultures mostly China since they were the first in most things in history(bronze , silk, gunpowder etc)