2-Slot, 200mm length "Pico" version of the GPU module has been built. Room for one SSD was integrated.
Length- 201mm max with the Pico
, or unlimited with external power
Width- 2 slots
Height- Reference height recommended, but the module can be inverted for more height and the input power socket relocated
Input Voltage- 16 to 24v with the Pico
TDP- Less than 200w with the Pico
Full writeup is posted on egpu.io
Although this version is super compact, making the cabling for the Pico is not very fun, so i'd only recommend going the Pico route it if you really enjoy modding and making cables. And the reliability of the Pico is unknown.
The HDPlex version will be much more "off the shelf" and doesn't need any custom cables, except for the latching switch, which is optional (it can just be jumpered "on" permanently).