Hi,
I have working with ultrasonic range finder sensor in past 4 years, I know how it works and how to selecting best fitted sensor for your application. For temperature sensors, we can use DHT11 or another lower price sensor, for GPS we can use Ublox GPS because of their great performance. As telemetry system, microcontroller and battery management module, we can use particle electron, as they already has integrated GSM module and cloud services, so we can easily integrate it to your systems.
Most of my recent projects were related to IoT especially to Cellular module, So I know how to manage this kind of projects very well. I also think that I have enough experience for your kind of application sensor.
Personally, I have became both firmware and electronic engineer since 2012 and has done lot of projects, from hobbyst to military based application.
Let's discuss the detail over chat. Let me know your thought about my proposal.
Best Regards,
Rijal