You may want to consider a generic LCD panel instead. Regular LSD is a rather dangerous drug, and I'm not sure how genetic altering would help.
Okay, seriously, this is something I've thought of myself. I even read an article back when Continuum had first been "revealed" by Microsoft how it was expected that such an accessory as a laptop shell would be a definite thing to be hitting the market. I would imagine there are companies that have already thought about this niche and are waiting to see how it plays out.
Give this some serious thought about the design. It needs to be something that:
1. Display works well with the Display Dock or USB-C to HDMI adapter.
2. Display works well with MiraCast
3. Keyboard/Trackpad should be Bluetooth.
Personally, what I'd like to see is a shell where the Monitor actually includes the display dock (of sorts, not the official one), and this dock would be like a series of ports along the edge of the monitor. A USB-C port to plug the phone in that would allow the phone to be automatically connected to the monitor and also have access to the USB ports.
It would be great to have a large enough battery in the monitor casing to power the monitor and charge the phone for an extended period of time.
Well, ports and battery in monitor casing or keyboard casing, I suppose it doesn't really matter.
This could be something similar to a Surface tablet type setup with a "bring your own cover and/or keyboard" or it could be more like a laptop or 2-in-1.
There are so many ideas for something like this.
As far as if I'd buy one, well, I'd have to buy a 950 or XL first, or something else later that supports it. So, not yet.
Something to think about though, if it supports Miracast, (by adding the Miracast Adapter behind the display) then you can use a non-continuum Windows 10 Mobile device with it as display mirroring with bluetooth keyboard and trackpad. This could increase the productivity of many people now, especially a 1520 user, or even a 640 or 640XL user. I could see myself using something like that with my 640 while on vacation and wanting to sort through photos for emailing to family, or work on emails.
Since Continuum basically only supports 1080p for now, that's all the resolution on the LCD you should need. That should keep the cost down considerably. I wouldn't mind having an 8" or 10" LCD with MiraCast and keyboard/mouse/trackpad for my 640 even. I'd pay for something like that I'm sure.