by LordHavoc » Mon Oct 10, 2011 4:51 pm
It is far more likely they imported the original .map from Quake in their updated editor and it "Just Works".
Now Wolf3D and Doom it seems more likely they recreated for the purpose.
In any case I noticed that everything seemed exactly matching, including the bevel clipbrushes on the inner corners to keep you from getting stuck in a corner (something many thirdparty quake level designers forget, so I've become picky about noticing these things in the original id1 levels).
Although it is possible they don't have the bevels in this case, since the player collision is probably more advanced in RAGE, it might be a cylinder or so, which would naturally slide past those corners.
The fact they only included the start room was probably an intentional limitation of the easter-egg - it's just there as a homage, not as a playable game (sadly), same with the other game start rooms they put in there.