Hi R1cky,
As OP says it ain't easy! :scratching_chin:
I did a lot of looking round for info on retro fitting the original set up and then went the aftermarket route.
It all went in ok and uses original steering wheel switches and dash light, via a home made adapter box.
It's been working ok for a couple of years now, no trouble with declaring it on insurance (it is a mod) and stops the right foot fallin' off when doing the long M/Way trips. :crazy_driver:
See this thread for details of what I did. http://www.landyzone.co.uk/lz/f9/freelander-cruise-control-help-needed-please-41525.html
It can be done but it ain't easy.
The attached will give you a feel for what's involved.
Quite a few of the aftermarket systems are the same - made by TDK and badged.
No problem declaring on insurance as a mod.