Ha ha, nice pic there!! From the fuse box, the big mass of wires goes down into the big grommet on the passenger side, to your ECU plug, you need to disconnect the ecu, & pull that up through the hole. Then disconnect the wire that runs under the carpet to the rear abs plug. Disconnect the rear ABS and pull it up through the floor into the car, and then through the car up into the engine bay. The only wire left is the fuel cut off switch, unscrew the switch from by the ECU, and pull that up through to the engine bay, and it should come out, there are a few cable ties that might need cutting to allow complete removal.
If you want to change to digital, then you would indeed need to use the interior loom of a digital car. If you want the air on to work, you would just need to wire the switch to the AC pump via the fuse box (inside the car), i think it's just a 12v switch. But then if your swapping out the interior loom anyhow, it would already be there. You would also need to swap the speedo and gearbox transducer for digital conversion.