Different single-board computers with similar GPIO positioning can be mounted on the base plate, also 2.5" hard disks (SSD/HDD).
Single-board computer without casing are sold standardly. Community or industry have developed casing forms out of most different material like paper, wood, aluminium and Plexiglass®. Often are these cases adjusted for a model of Paspberry Pi.
OpenDisplayCase works here:
The installation of OpenDisplayCase Base with SSD 2.5" mount and the expansion modules is documented at the following page:
2017 have come out some single-board computers constructed in the form factor of the Raspberry Pi. These boards are automatically compatible with the OpenDisplayCase
On March 14 2016 Western Digital presented the PiDrive 314GB with USB port in 2.5" format for the Raspberry Pi. This hard disk is compatible with the: OpenDisplayCase.
Not every TFT display fits for every single-board computer!
If the TFT display fits depends – for one thing – on the used GPIO Header (Female Header) [female header]. Here versions exist with 9 mm and 19 mm and if it is adjusted for 2x13 or 2x20. Also matters the design height on the single-board computer.