Engineer: Dispensing an erector!

Okies been spending an odd day or two trying to learn the source engine so i could make, hopefully, a half decent Tf2 map. I've got a plan scrawled down on paper so im just following that at the mo while encountering a fair few of Hammers bugs. The pics show the Red spawn with paths branching off to the A and B points. All wip although im pretty happy with the lighting
Also: sorry Dave but i had to use it :0