Custom Linux distribution and printing solution

In need of a custom Linux distribution (Debian based) for a kiosk application, but keeping in mind that hardware can be different, in need of default networking, graphics plus the Adobe Air Framework should be in the default install, as our application and it should support printing (POS). Therefor we also need a simple Linux application which act as a simple socket server listens to clients requests which will include printing requests which should be printed to a POS-compatible printer (USB or LPT) (a C# version of this application is available) In the end this should be the scenario (in case of custom distro). Linux install on a machine after reboot, our application should start (at application end, it should shutdown the pc). A long-term cooperation should be an option, as we're expanding our business.