After reading a lot and talking to a number of cage builders i've decided on a design. It is much more costly than i'd anticipated and is unfortunately a compromise so the cage can be engineered for the street.
For those that understand cages it is a CDI weld in cage. Main hoop with single cross bar, X in the stays to the rear strut towers, bar between the struts. Front will be pretty special but i'll wait until its done to share that.
Next steps
Tear the engine out. Will hopefully have pictures of the widebody very shortly.