Right, garden it is. And no it won't grow mangos.
Basically the idea is a stream/fountain system with ponds and wotnot, dividing the microgarden into areas. The fire feature will sit in a pond opposite the water fountain, allowing for reflections... will look something like 4/5 candle flames on a rock pile. One part will be mostly mosses, another a tiny sand garden, another will probably centre around a small fern, etc.
Interestingly this kind of thing isn't uncommon in Japan, a lot of the plants I'm looking at (including the brilliantly named Yuri Hime) are Japanese. I'm not really a fan of bonsai, although I realise it's pretty much perfect for what I'd need. I may re-evaluate the idea as time goes on.
Anyway, ideas for features/plants etc now being taken. I've not yet found a suitable small climber, I'd be especially interested in ideas for such. I've already found micro lily pads, mosses are an excellent substitute for a large range of plants, and a large list of candidates for larger options.
Pic semi related, it's a Japanese Zen moss garden.