Arduino PCB ATMEL & SIM808 GSM/GPS

Low on the budget...sorry (-: Design and build Arduino PCB Include: ATMEL CPU ATMEGA2560 @ 16Mhz (Arduino). SIM808 GSM/GPS Module Accelerometer Sensor ADXL345 LiPo Charger UFL Antenna for GSM and GPS Vibration Sensor SW-420 On-board USB to UART CH304G Lithium-ion Charger LTC4054 5 volts tolerant input ports PCB Target size - 40mm diameter or similar small size PCB Layers: Multilayer More Info: The PCB need to work at 3.7v, main power input will be between 9V to 12V (CAR) and will be a backup battery 3.7 Lipo that need to always be charged and start to work if will be power lost on the 9v-12v input. the device need to know that on I/O pin and i need to know when to unit is charging and the battery level. You Will need to provide 4 working unit for POC, include all the components and PCB Printing. The unit need to be included with Arduino BOOT ready, I will upload my own Arduino code to the unit. I have already PCB file and design you will need to check the file and update them. Summary of my request: 1. Full 4 working units! in plastic box. (you can see the box in the picture files) 2. Arduino boot ready for the units. 3. Full documentations 4. Full PCB files. If I will be happy on the results, will provide more project on the future. There will be 4 milestone payment. Please look on all the file, all is almost ready for you (-: so the price offer will need to be low. (the Datasheet_v1.2 is old...so will be only for reference) You will need also to provide plastic box for it - 3D Print , provided pictures in the files.