What is the best method to create a roof frame family that can quickly be dropped in to a model and align to the slope of the adjacent framing. What I'm looking for are small roof openings with steel angle frames, larger openings with channels, mechanical platforms with channels or beams that sit on top of the roof framing etc. Doing these individually is just too tedious with rotating/adjusting the placement of each member to the correct orientation- but it does attach to the sloped framing. There are so many roof types in play (flat, mono-sloped, warped; individual members, beam systems, imported from RAM...) that I think the best way to approach it is by selecting the adjacent framing not a work plane or roof to place the frames.