I have a Mercury 3D-printed camera that I shoot with a 47mm XL. It is perhaps 8 ounces with no lens. The maker can send you the proper setup - just add a lens.
The 47mm XL is a specialty lens and is very wide, as I am sure you know. But be sure that's what you want. You can also configure a Mercury with a 90mm of some sort if you want a more typical wide-angle. You can build a system any way you like and it will be super lightweight.
Here is an image I made with this setup a few days ago:
And I also use the camera with a Horseman 6x12 back, sometimes along with a 38mm XL lens for an even wider horizontal view:
I highly recommend them if you are looking for low weight. I am sure the Cambo is "nicer" in some way but...it's just a light-tight box. No need for a lot of complexity with a point-and-shoot ultrawide IMO.
More info on the Mercury here:
http://mercurycamera.com/
By the way - I really don't recommend using half darkslides for panoramas with ultrawide lenses. The problem is that you are using the lens with 2 inches of rise or fall that way. There is no way to "center" the lens on a panorama because movements are extremely limited with such compressed bellows (or impossible on a rigid camera obviously). Perhaps there will be a small number of photos that this is good (architecture) but it is extremely frustrating for most photos. I know because I've done it, on 8x10, and if I want to use my 120mm it never works because of this issue. Otherwise my trees/landscape is all skewed from distortions caused by the rise/fall.
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