I've been dismantling and moving the old, pumpkin hill, compost pile. I'm about half done and this bed is about half filled. I still need to amend it, but I can do that later when I spread it around to other beds in Spring.
>>1148707>indoorsIt is mostly about adequate lighting.
>regrowing cabbage topsIt is just a leafy plant, all the leaves on it are edible. Meaning, you don't need to cut the head off to have something to eat. You can take the outer, older leaves instead and let the centers keep growing. There are various cultivars. Some are very compact and some are rather loose and don't have a "head" per se.
>growing enough food for self sustainmentThat depends on your level of sustainability, diet type, and a few other factors for how many you need to plant. If you are a full vegan, growing all your food indoors is going to be quite an endeavor and perhaps rather expensive. If you don't eat all that much in vegetables or fruit then it will be cheaper and less labor intensive. For cost it all comes down to diet, space available, natural light availability, and artificial light requirements.
The best way to figure this stuff up is to make a list of everything you eat and how much of it you are eating per month. then cross reference that with the average harvest yields for those plants per square foot. That will give you a rough estimate for how much space is needed. Keep in mind that various styles of growing food will give you different levels of space usage. Some just are not good for indoors, but others are great and maximize how you use the space. These things change the yield per space results.