Mounted subpanel, wiring work

Installed the subpanel and old instrument panel to see where the G3x black boxes and avionics would fit. As expected, the GTN 650 is longer than the space between the instrument panel and subpanel, so I'll have to cut out a section so it can fit.

I also kept going on the wiring. So far, most of the wiring has been point to point, meaning you simply put a wire on one end and connect it to another. I've been putting off wiring the CAN bus, which allows the avionics to communicate with another. Unfortunately, it's odd how it is depicted in the wiring diagram.

You can see that here I have to make some sort of splice, so that two wires come together and only one wire comes out (actually 3 in 2 out for the CAN lo pin and CAN termination pin). How you physically do this is beyond me. I suppose you can use solder sleeves that make a soldered joint for the wires. I suppose a butt splice would work too, but the idea is to avoid a method that increases the size of the joint too much. The solder sleeves shrink when heat is applied to them, not so much for the butt splice. 

Anyway, here's my first attempt - which I screwed up. 

The method for doing this came from the G3x install manual and this VAF post. Anyway, I'll need some help before I continue on with the CAN wiring.