However, I did consider flipping the manifold, but was concerned about the height of the turbo. You mounted your engine low and back didn't you? What sort of bonnet clearance did you get? Any problems with turbo heat affecting the bonnet?
Having it up there would be handy to clear the starter and bellhousing comfortably...
EDIT: Admittedly my experience with tubular manifolds cracking was with a custom job on my old S13 CA18DET which did not have support stays.