I've always kind of viewed wrap and strap as SIP's unaccomplished little brother. It seems to me to be a lot the same concept when it's all said and done, except that SIP's must be manufactured and need heavy equipent while one guy could wrap and strap by himself.

Most of my efforts have been focused on ways to refine the concept of exo-framing (if there's a better term, please tell me)
It is bothersome for me to have redundancy in my projects, where you essentially build another house around a timber frame. But I've yet to find a very good way around that.

I've worked on systems relating to wrap and strap, exo-framing, and infill-framing, which leaves only a portion of the framing exposed on the interior.