NODE has been on a quest to make the perfect portable Pi for a while, his first iteration used a Raspberry Pi A+, while his second upped the ante with a Raspberry Pi 2 and is still to this day one my favorite Raspberry Pi projects. I haven’t gotten around to actually making one for myself, and now I’m not sure which of these two I want to try and make for myself first.
Each of NODE’s iterations has improved or changed the original concept slightly. This round the project packs in a 3D printed case instead of a few retrofitted and commercially available parts, which feels much more high concept than the first two.
There are a few different small screen variations of Raspberry Pi operating systems available too, so you should be able to find something that works for what you want to make.