Thanks for your feedback!
I get that this is energy intensive and against a lot of permaculture principles but I don't have the land available right now to try it outside. Ideally, I would be doing it on a hugel mound outside with an even bigger polyculture going, but it isn't possible... Yet!
Maybe I'm just getting over excited, but I thought I would start experimenting with things so I would be better prepared for when I can take my work outside.
It's great to know that comfrey couldn't create nutrients without the option to root deep. I didn't even think about it, but it seems obvious now. You don't think comfrey would serve any role in a box garden then? Does that also means that companion planting pretty much isn't possible indoors? Would the favas still fix nitrogen?
What percentage of compost would you recommend the soil be made of?
Also, any thoughts on adding mushrooms to the polyculture?
Again, thanks for pointing out my noobish errors and educating me a bit.