Please fallow the below requirements and please bid only if you have prior raspberry pi io board experience. and board should be tested throughly from your side.
any suggestion in designing board will be accepted like separating the concerns.
1. should be two layer board.
[login to view URL] (SDIO) and Bluetooth(UART) should be integrated which has compatible yocto drivers respectively.(like rtl8723bs).
3. one 4 lane CSI camera port with camera driver board should be integrated for IMX219 and also OV5647.
[login to view URL] codec with audio amplifier should integrated (like WM8960) with speaker out or else pins should compatiable with ReSpeaker 2-Mics Pi HAT
5. some LED indicators of system states(like booting,ready)
[login to view URL] management compatible with (6v 2a) power adapter
[login to view URL] out as grouped JST port out.
8. Two, 2 channel ADC like (HX711).
9. two stepper driver and one electromagnet control relay.
10. one usb port
[login to view URL] video out RCA
4 freelancers are bidding on average $374 for this job
I've ever designed a Raspberry CM3 Evaluation board, the time I propose you breakdown as follows: 7 days designing the PCB, 7 days manufacture the board for prototyping, 7 days for assembly and testing.