Revit and corner curtain wall joins

I am quite mystified why a simple angle junction between CurtainWall or Storefront is so difficult to get to work cleanly- these methods seem to be common but flawed:

This is what I want!

• Embed ought to be the easiest method as allows simple parameter control of cill and head height. But it doesnt work properly: the intersects don't join as a wall should and you invevitably get a silly stub of parent wall overhanging the "join". And how do you join in a way that Revit doesnt throw up an error?
• Divide and delete the wall corner and then add back parent wall below cill and above head. The curtain wall does join properly but why should you: windows and doors dont require 2 operation cut hole then add in a hosted component!
• There are lots of methods posted but none seemed to satisfactorily do it in one. 
• Autodesk arent particularly helpful - absolutely nothing I can find in the new (2014) Revit Help (which replaces Wiki) other than definitions of corner mullions and join conditions. 

But I dont want this with L corner mullion onto a corner which doesnt join

This is my workaround which seems to work give or take a few issues with the curtain wall centreline. The only difficulty is  placing split element lines in the right place then getting them to adjust with a ref line or locked to other elements. I also found it is much better to place the curtain wall/storefront without mullions - just grids and go back and add after. So here goes:

Host wall set up (cavity brick block here) with some level lines to constrain the CW to. Also ref planes pinned where the hosted jambs lock.















In each elevation, pick the Split Element tool (Mod panel) (read http://autode.sk/1bPqzvQ on how to do this and it does take some trial and error). Try and lock to the head and cill levels. Lock the vertical split line after in plan view by 1) disallow join 2)lock align one edge then 3) reallow joint to meet up the other with this. Again some trial and error to get this flexing properly. You should then have 2 isolated masonry panels in the place where the CW is to go.

In 3D pick the split parts og the wall, in Props change to Storefront (or Curtainwall) (SF/CW) and make sure the type props are set with "none" to all mullions and set roughly the grid you require (adjust this after to lock to levels and ref planes as required). The intersecting storefront walls remain joined.

Then IMPORTANT move the SF/CW baseline which will be on the hosting wall -highlight the whole wall segment, pick the "drag wall end" (changes to thick cyan dashed line) dot and drag sideways to align hosting wall centreline and do the same at the opposite end. This make sure the SF/CW wall segments remain joined.
BUT I always place masonry walls by outside face (to lock to ref planes based on survey measurements). If you place "by centreline" you can avoid this step

 You can then add a corner mullion WHICH CLEANS UP CORRECTLY just by hover and pick the vertical on the corner. (This doesnt happen for embedded CW's) . Then adjust the grid / add more grids as required.
When you place normal mullions they are likely to be incorrectly offset. Easy to remidy

Adjusting glass position and mullions

1. Pick any glass panel (hover and tab), unpin then alter with TYPE PROPS  offset as required. You may have to duplicate type if there are other curtain walls with different depths
2. Select any mullion, TYPE PROPS and again set offset by trial and error to move in relation to glass

And there you have a method that works. I spent about a day searching lots of posts and I found all sorts of solutions from inserting void extrusions for getting rid of the unanted bits of error masonry, overlapping normal mullions and then trying to delete one and modify the other into a corner, setting up special profiles  but none worked. One other solution is to set up a cutting void family with instance parameters to lock into the corner and cut the corner aperture, then infill with wall which I think will join correctly at the corner. Again I would advocate starting with masonry wall to cleanly form the join and change with PROPS to CW/storefront.