Basically, considering you can battery power the Pi, I thought you could build a small-scale portable Pi at considerably less cost than a laptop, and so I did.
This is the setup I ended up with:
4.5inch car screen, (requires 8 AA batteries),
Logitech K260 wireless keyboard and mouse
Jaycar electronics gear, pretty basic wire up system qith a couple switches.
Still working on the case to house it all, but will update once it's all together.