Thank you for the mention. Of course the 2 devlopers @markegiles and @disregardfiat can answer any question in more details; I can help anyone get started. Especially if they have never used, glitch, github, 3D vectoring etc.
You next step is probably to go into the builder and pressing ctrl+ alt + I. This will bring you into the INSPECTOR. You can now resize your obelisk and add more images!
I've been working on that resize business thanks to your instructions. I'll get back to it again and try to get it right.