also remember sv_pure 0
patches, working triggers, doors, rotating stuff, shaders all looking like they're supposed too and a not too awfull attempt at outside the window stuff.
Now go forth and make something that looks nice, dont use excessive entities (ie dont use them except for lights, doors and decoration) or shaders, just make 2 or 3 rooms that your proud of when you stop and look at them. Use as many or as few textures as you deem necessairy and try out different lighting methods (entity, brush/shader), play with lighting lots.
and (disgruntled idiot) stop impersonating Who so poorly, Who is endearing next to you.