While I don't know of any "tutorial" for connectionHoses/Pipes that you're wanting to work on, it also isn't rocket science if you kind of pay attention to how existing vehicles/implements are using what you describe.
Have a close look at something like the Kuhn BTF4000 (seeder) and the Kuhn TF1500 (front hopper), peruse the xml's for each, paying attention to the <connectionHoses> sections. The information from something like "TOOL_CONNECTOR_TOP_RIGHT" is stored in *\shared\connectionHoses\connectionHoses.xml. From there, you can look at a tractor (with front 3 point hitch) and see how it has the addons for the pipe. In the tractor xml, pay attention to the <connectionHoses> <toolConnectorHose> sections to see how the fits/follows the rail front to back. When in GE, pay attention to the various *_frontConnector/*_backConnector transformGroups (markers) and their specific x/y/z's and rotations. You should begin to grasp the concept, albeit time consuming
