His initial idea was to create a flexible and open portable SDR device, however keeping the device open and built for general use meant increased complexity which quickly slowed his progress. Instead [Nathan] decided to focus on just ADS-B for his portable device as living near an airport he’d been interested in aircraft tracking since his first SDR arrived.
The device consists of a Raspberry Zero, RTL-SDR, 3.5″ IPS LCD and a battery pack for portability. For software he uses dump1090 with some custom code for the map plotting. Together with a 3D printed case and some buttons, the result is a very professional looking portable aircraft tracking device.
Hopefully Nathan will continue updating his project page so that others may replicate it on their own.