I am a level designer for the Source engine. I am currently working on a couple of mods, including the remake Black Ops:Source. Since I have been working with the Source engine for about 3 years now, I know most of the tricks and loopholes of level design. If you have any problems with hammer, let me know and I'll do my best to help you out.
Model development of the "Big Mamma Pod", day-by-day, with full renders for each step.
Current Step: Pending-Approval