Build a custom open wrt image

Hello, We are developping a captive portal product for some of our customers. We already have a captive login page and a server with freeradius installed. We are looking for someone able to build a custom Open WRT image with a Chillispot integrated. This one will be certainly for the router NEXX WT3020H based on MediaTek ( or another one with the same characteristics ) [login to view URL] The firmware, as soon as the router boot, need to grab the configuration from our radius server ( walled garden domains, radius ip adress, captive login page url, session timeout… ) depending of the router MAC address and use this configuration. We need a "ready to use" device. It needs also to auto-update every X hours. Furthermore, the firmware has to be ready to install through the website GUI, and we have to be able to change the SSID from our server. We are looking for someone able to act also as a consultant, and guide us through the AAA process ( for example what are all the attributes we can send to our router ). Thanks to give us a quotation for that kind of job. Every remarks or question is welcome. Regards. Cedric.