After a long time in the todo pile I got around to working on it this weekend.
These steps will walk you through setting up an AnyfestoBox on a CHIP http://docs.getchip.com/chip.html
Anyfesto on a CHIP 9$ computer.
N.B. This set up will use CHIP's wlan1 for the captive portal,dnsmasq, etc etc. wlan0 is left free to connect to backhaul, the
intertubes or whatever network you may want. No bridge has been set up by default. Lots of ideas for use of this.
Parts List CHIP - https://getchip.com/pages/store - $ 9.00 USB Stick 32GB or Bigger - Many Sources - $20.00 - upward LIon Battery 3.7V 2500mA - https://www.adafruit.com/products/328 - $29.50 5V 2.4A 6' MicroUSB Cable - https://www.adafruit.com/products/1995 - $ 7.95
The up to date full set of instructions is housed over on the Anyfesto GitHub