Hello,
I've been working with OpenGTS/GTS Enterprise, and Traccar for the past 3 years. My development efforts have been in the GPS arena almost exclusively for about 4 years.
Installing OpenGTS on your server is AWS problem, I've done it about 10 times or so.
I do need to see what you want done to the OpenGTS UI so I know what you need
There are a bunch of Android apps out there that will provide most of the OpenGTS functions on a mobile device. Two are available from the OpenGTS site, but I don't think Martin has released the source for them, yet. I'll see what I can get out of him regarding that.
You say that you have Traccar up and running did you intend to use it as a replacement for the OpenGTS DCS's? I ask this because Traccar can be used for that purposed, but it can not be used as the UI for OpenGTS.