I have not, but I am now. I'm not sure how much I want to build outside the grid, because I'd have to build my own walls and roof outside the grid, but let me watch the whole video first.
Interesting commands:
enterbase - enter your SG's base
enterbasebysgid <INT> - enter somebody's base presumable by the numerical ID of the passcode.
vscale <INT> - increases vscale graphic option to have the GPU draw more of the base (useful for very large bases)
nocall <0/1> - turns collision/ clipping on or off for editing character
Wonder if these will work outside of the closed beta.
Also, have some Inf.
Edit: wow, this is like a master class, even with Leo being "not a base builder" :D