Hi Tristam, the hub you mention is my one and only attempt at a capstone hub :) I had so many 3D product articles I wanted to try and organise them into an index. So I followed darkside's info on capstone hubs and livewithrichard's experiment in adding a "back to main page" link on the 3D articles to try and keep visitors on my pages (this second part is the most recent addition).
I don't really have a system as such, but do realise that the hub you see now has been tweaked many times to try and get an appealing layout! To be honest I'm still not 100% happy with it.
If I have a system at all it's to continually improve hubs as I learn more and to try and squeeze every last cent out of my work :)