Any hams taking a rig into the backcountry? Anyone doing QRP HF in the field?

I'm thinking of making a Raspberry Pi into a software defined radio transceiver using a TV tuner dongle and a longwire antenna but not sure about what to use for a power supply. It would need a screen and a little keyboard/mouse combo, as I'd like to do PSK as well as voice and CW.

Has anyone done something like this? Or anything else small and fun for backcountry HF?

Jeff KD6HUL