Hammer Editor

[Rentafence]

[Ki11a_FTW]

doing it with brushes would be easy since the window is mostly boxes, but you can do it in max if you really feel its necessary, either way i dont think it will effect anything

[Darqeness]

If your map isn't too large it won't make too much of a performance hit. Just make sure that you tie all the brushes used for detailing to a func_detail entity.

[Sel]

There is a limit on brushes, generally you use props for those.

[rossmum]

Use props.

[CabooseJr]

Make it a prop.