Is there a North Face shell that would fit the Nuptse?
Ie, the Nuptse would zip into the shell.

This zips into the Varius Guide jacket. I personally love zip-in compatibility because it makes it easier to put on/take off, and I don't worry about the two layers bunching up or rubbing weirdly. Just my experience.

The moiuntain light summit series is designed for the Nuptse to zip into, it is a great cobmo

comfortable when zipped into the mountain light.

I never zip my inner layers into my outer shells, but wear them zipped up independently over one another. Kind of how my underwear is independent of my jeans, I don't connect the two. This way if I have a mid layer I like and a shell I like, I don't have to worry about them being "compatable" and just buy my shells based on the expectation of using them over my mid-layer fleeces or down vests or jackets. I personally have never been a fan of parkas that have zippers for connecting inner and outer layers. It only makes something that once was easy more complicated. It is much easier to shed or add layers when they are not connected.

James, Thanks for the info. I was hoping there was a short list of shells that took the Nuptse. Its a pain checking the specs for each coat.

Just by looking at the zipper, standard YKK, I would say you could zip this into any TNF jacket that has the zip in capability(it says whether it has it in the tech specs). Zipping it in may not be very good though because of the thickness. It may be too bulky if zipped in. I would just put it on under a shell instead of zipping it in.