Great that you were inspired by this. We have gleaned much inspiration from other projects that have fueled our passion and knowledge in years past. As for guilds, it is a basic framework. We established this guild based on what plants we had on hand. We are slowly building up our stocks and will plant out the rest of the fruit trees in time. As a general guideline though, comfrey is AWESOME! We will keep spreading it (it is VERY vigorous, has profuse growth, is edible, is a great medicine, accumulates nutrients and provides pollen).

To keep it simple a guild will often have one or more of each: N-fixers,(not seen here are clover and annual peas), Dynamic accumulators, insectary plants (insect forage) and pest confuser (herbs, allium, etc). Hope this helps. If you're into diving deeper, I would highly recommend "Gaia's Garden" by Toby Hemenway. We will make a post focusing on guild soon, so stay tuned.