Pictures... hard thing to make sense of... little black wires running on and beside little black pipes and wires and stuff....
So.. considering you are good with English

(gooder than me anyways...

)
I've made my own fuse panel, with part of it switch via a relay driven off my accessory plug, part of it live all the time... I run my GPS live off this panel, and the Autocom is switched... You can by these kinds of things from NN or elseware.. mine lives under the LH side trim in a spot that seems made for it.
I've plugged my GPS sound cable to my Autocom via a "Ground Loop isolator" (Autcom sell this, but you can go to Maplins and buy the same thing, much cheaper)... I have a Garmin 2820, so I've plugged the mono jack into my power cable, which has a mono plug in it for the purpose... This plug resides on the RH side of my instrument cluster... I only use half of the GLI, as I don't need to run the microphone to my GPS, and don't use the stereo plug.
I run the wire behind the bit of plastic below the cluster, then along the cables and pipes under the Fuel tank (RH Side)... my power to the GPS goes the same route... For starters you can run both under the exterior trim outside the tank... mine was like this for over a year... Just protect the wires from chaffing with some electrical (or if you don't mind a mess, duct) tape
If you find your GPS sounds 'scratchy' you definately need the GLI's... they cut down the interference caused by having the GPS plugged into ground, as well as the Autocom...
My autocom is held on where the owners manual is supposed to go... (almost everyone's puts it here as far as I know... it just works there...
The GPS and iPod cables are looped and coiled into neatness below the unit...
(wires exiting out the bottom, coils held in by tywraps the exiting wires) The two unused (in my case) big Autocom cables are partly coiled below, and partly laying coiled in my tool tray.
The Main big Autocom cable is partly coiled below, and runs up so that the plug exits between the front-top of my seat and the tank, on the LH corner... it has my iPod cable attached to it with tape and tywraps... (I'm tall enough that having the plug end held at the seat/tank interface will cause a detach if I stand up, so I have 8 inches or so of cable hanging out.. a longer extension cable would solve this). I have the supplied extension cable plugged into this plug, with my iPod cable attached to it for a short distance...
When I ride with no tank-bag, I attach my iPod to my suit chest pocket and the two cables run together up the RH side of my chest, one ending at my helmet, one ending at my chest, in the iPod... I take care that if (when) I exit the bike without unplugging.... nothing rips... the plugs just pull out.
Sitting down I have a coil of cable laying on my Left leg... sometimes it gets trapped between my thigh and the tank... I feel it when I move my head.
When I ride with my tank-bag (BMW OEM) I run the cable up through the strap that holds the bum-bag to the tank-bag... this causes the coil to be above my leg and clear of getting trapped... My iPod then lives in the map-holder.
My 2820 connects to my phone via Bluetooth, so I don't need to connect the phone to the Autcom... I don't bother with the microphone as I don't want to talk to anyone when I ride anyways... If I want to know if I get a call, I link the phone to the GPS and it display lets me know the phone is ringing... If I wanted to have a phone plugged into my Autocom, I'd have to make or buy the special part that allows GPS and phone to be plugged in to the same spot...
Things to watch for...
The battery in the 1200 GS is a major source of electrical noise... don't lay any coils, and especially your Ground Loop Isolators against it..
Don't let the wires chafe
Don't arrange it so that you get your neck broken by the wires if you get tossed off...
The Autocom doesn't mind getting splashed...
don't put it in a bag as this holds moisture in and will wreck the unit.
I put a bit of silicon grease on the rubber Autocom plugs to keep them slippery and working well...
Hope this is readable by someone else besides me...
Al...