Design me a Product

Dear, we want to design and implement AV selector. description: AV selector , with AV 4 inputs and one outputs (like multiplexer), each AV input have 3 signals (2 audio and one video signal) , and the output have 3 signals., the AV inputs interface are two 3.5mm plug and two CVBS controls: there is two ways to select which inputs connect to the output 1-two switches (up/down) with each press the output is connect the the next input then rotate when it reach the last input. 2- two digital input pins two select the channel (00,01,10,11). other output: two digital output there reflect which input channel is selected power: the system should powered with 12V DC as input power. other requirements: 1- will design that include required filters and protection 2- can work at temperature -10 to 70C 3- small size as possible. 4- using PIC uC is preferred. deliverable: 1- schematic 2- PCB layout 3- Gerber files 4- parts list and quantities 5-Prototype (will discuss it)