So here are the pictures I took.
Hope they help.
These are the two holes I drilled for the solenoid.
It's much easier to put the bolts that way otherwise you will have problems to insert the nuts with the solenoid in place.
As mentioned in the illustrated upgrade, I also ran the ground wire through the rubber flex tube inside the car. Really easy to do with a coat hanger.
Concerning the connection with the TWS receiver, someone in the feedback of that illustrated upgrade mentioned that NAPA has an insert that works (part #784507, 5 pieces for $3.42). I haven't found it so I took one of those connectors you usually use to connect two wires together (the one that are cylindrical). I removed the insulator and kept the piece of metal that is inside. I connected one side to my wire and I filed the other side till it could enter in the TWS receiver. If I remember well, you have a blue plastic thing on the receiver to hold the wires in place. You can remove it and put it back once your new connector is ready and fits in the hole. You have to insert the connector all the way inside to be sure to make a proper contact, so don't file only the tip of the connector, but on it's whole length and don't make it to thin so that it's tight in the whole. Well, I hope it makes sense.
Let me know if you need more info.
It took me more than one hour like it's said in the illustrated upgrades. Maybe 3 but I really took my time. But definitely one of the best mod you can do to a Gen1. You won't regret it!
