The minimal but powerful setup of a Raspberry Pi, WiFi dongles and a power bank is packed into a flat and lightweight acrylic housing fastened to the Server Entity. Apart from wardriving, it runs a web server, router and regular access point, which can be used for both general internet access and advanced file and information sharing. After connecting to the wireless access point, the user has immediate internet access - if a nearby network was hacked by a Server Entity.
Cat Exploit is not necessarily limited to cats, though they proved themselves as the most promising carriers as their moderate trainability and natural habit of roaming around perfectly fits the requirements of this project. But also related species like foxes or raccoons might be well suited for this stealthy task and worth a thought depending on the local conditions.
Have you considered using cheaper hardware such as the Zsun? https://wiki.hackerspace.pl/projects:zsun-wifi-card-reader