Hi Guys,
I'm currently in the middle of my 915 installation. I decided to chop the torsion center out and will be bracing the top with box steel (probably 1.5"). I will of course now be running a coil-over setup (thinking of SPAX from the UK at present with helper springs to soften the daily drive). I'm also installing 944T trailing arms (i'm still researching the CV issue
).
With the center torsion housing removed the CV joints on the trans seem to line up with the the trailing arms.
I also made mounts that i welded to the trailing arm housing underneath, these will then use universal bushing to mount a front transmission mount.
I ended up purchasing a 911 shifter and shaft (with i wil lengthen to suit). As far as clutch pedal, i will be modifying the existing VW one.
For a lot of this information and design considerations i used the articles you have mentioned plus Rich's site
http://www.ricola.co.uk/