Looking for help with building height planes

[brooke]

As part of a DA in our council we're required to have Building height planes shown....It's basically 4m UP from the "natural ground level" in 45 DEG and a ceiling of 9.5m.   You are allowed to "average" the natural ground level . (see image 1).

I came across an excellent Railing family which you can height adjust and I have used that and "picked new host" to connect to the specific topography I have done on the boundary.

My Questions are :

1. How do I clean up this railing so that the 45 deg section fillets properly with the 9.5m height  (see Image 2) rather than overlapping.

2. Technically the "ceiling" of the hight plane is supposed to be connected to each side of the plane, which means in this case it's on a slope.  One one side I'm clear the other side theres a clear breach.  If it was sloped to match the boundary heights on each side that breach would be significantly less.  (3rd image shows BOTH height planes).   Is that possible to add?  

I have had very little training on revit so unfortunately most things are self taught.  This is well above my pay grade and I need some help!

[Alfredo_Medina]

Hello. It's not possible to "fillet" or clean up the top of railings. Maybe you can do this with another tool: some model-in place volumes that you can do with simple extrusions, some from the ground going up, and some others from an elevation view, with a triangular shape and some depth. Then you can make those masses transparent and with some dashed linetype. 

[ToanDN]

Create a flat roof, edit subelements, add points and raise them where railings intersect.