ah, cp_scarlet. It was done by Kirameki. He has been doing maps for a long time, but his SDM is basically different:
While I went with the objective to make a map of the SDM and adapt it to TF2, he went with the objective to create a TF2 map and make it look like the SDM.
I believe my choice was better though.
Also T34G3 to solve the Engine Hunk Overflow error (and you're the 99th who didn't read the installation instruction, so don't worry) just add "+r_hunkalloclightmaps 0" to TF2's lauching parameters.
What's wrong with the cubemaps in the video/screenshots?
wut?