Installing propane heater into existing line

I would like to install my new Olympian Wave 8 catalytic heater into my existing propane system. The best spot that I can see is under my main counter area (built into one of the slides). The attached photo of the line that services the propane range is where I am thinking of doing this. Also a photo of the heater connection. Questions:

1. can I plumb this using brass screw fittings as opposed to cutting copper line/flaring etc. as I am not experienced with this.
2. what kind of hose would I purchase to run to the heater?
3. the heater comes with a low pressure regulator. Am I right in assuming that gas to the stove is already low pressure and I won't need a regulator?
4. I don't suppose I can use the low pressure propane line supplied with the heater?
5. out of curiousity, what is green is the heavy guage green wire attached to the copper propane tubing?

I haven't totally decided on whether a quick connect is needed or if I will permanently mount the heater on the bottom of the counter unit.

Thanks for any advice.

Dave B
2006 Monaco Camelot 40PDQ