Pixhawk V1 + SiK 915MHz Radio over UART

Are you saying is that the Emlid Reach RTK doesn’t integrate completely with Pixhawk (Ardupilot) with long range radios and dual GPS?

Clarifications
-So is your communication over serial with the SiK radio actually working or are you using TCP?
-What did you alter in the code (ardupilot and/or reach)? How do I recompile reach code to the module? Is it a grueling task?
-Have you tried flying with reach as primary and only GPS? What were your results?

Came across your post in this topic which is related, can you comment on the parts I bolded/italicized.
Wondering if these four (4) main bugs have been fixed?: