Is there a way to make rakehead windows follow the ceiling
instead of the roof i.e. where a scissor truss is used ?
The windows don't actually follow the roof. They follow the top of the wall. So if you will extend your ceiling out over the wall then edit the wall and select Fit to Ceiling the top of the wall will follow the ceiling. And as a result the tops of the windows will as well. The tricky part may be the gable wall above the windows. Depending on how high the windows are selecting Gable Provided by Roof may cover a portion or all of the windows. If that is the case you will have to find another way to fill in the gables if you are concerned about 3D. If just for elevations then it is no big deal.
Bill is the owner and maintainer of SoftPlanTuts.com