How to tweak S/H conditions to meet plants' needs

[Mr.Fakename]

I've been reading as much as possible about S/H, but there's a piece of information I'm lacking before taking the plunge:

How do you choose your container's shape & size, reservoir size and so on, for each plant?

I want to keep pretty short wet/dry cycles on some plants, but others can stay moist all the time.

Regarding wet/dry cycles, isn't dried LECA going to desiccate roots?