Zacker: The reason I chose to add some red and blue was to spice things up a bit. Although I think I may have chosen the wrong shade of blue...
Bic: The point of the custom assets was more to show that I could make them than to actually expand on HL2's models. The original plan was to add more to the level, with the heavy machines in another room, and this being more of a little office/small workshop. I may eventually get around to adding some more to it.
Adam: I agree about the noisy comment, I think I got a bit carried away in some spots. I think what's throwing you off on the scale is the large amount of distortion that happens in Source near the edges of the frame. Looking at the windows now though, I think a different setup for the bars might be in order, it does look a bit off.
Everyone else: Thanks!
MapCore seems to be quite active in replying to threads compared to some other forums.