Hi Sam,
Welcome to the Heartland family and to the Owners Forum. I'm sure you'll find a lot of useful information here along with a lot of friendly people willing to share their knowledge and experience.
As to schematics, I've seen a number of requests for them in the past, but I've never seen any come forth. If there's something specific you're trying to do, you might want to browse the relevant section of the forum to see if there are existing posts that provide the info you need. If you can't find any, post a new thread asking for help.
There are also a number of manuals and some things, like COAX layouts, that can be found on the forum by pressing the TOOLS tab at the top and then
Heartland Owners Manuals.