Simple Schematic + PCB Layout for a Dual-SIM 4G LTE WiFi Hotspot (Quectel SC200E/SC20, RF experience required)

I am developing a portable battery-powered WiFi hotspot (MiFi-style similar) based on a Quectel smart LTE module. The module integrates the application processor and WiFi/BT, so no separate router SoC is needed... (Budget: $30 - $250 USD, Jobs: Antenna Design, Bluetooth, Electrical Engineering, Electronics, Embedded Systems, Microcontroller, PCB Layout, Signal Processing, WiFi, Wireless)