This is a detailed paper on building your own WAP and Wireless IDS system from scratch using open source tools like Kismet, Snort and Sagan.
You can download it from the following link: https://packetstormsecurity.com/files/download/111840/wireless-ids.pdf
Source: https://packetstormsecurity.com/files/111840/Building-Wireless-IDS-Systems-Using-Open-Source.html