3 way wiring w/o neutral

So in the interest of not blowing up any more switches I just wanted to make sure I’ve got all my ducks in a row and that we 100% understand each other etc, etc. sooo…

I ventured into the attic after work tonight, and found the junction box. It was pretty much what I expected to find:

So, here’s a full diagram of everything that’s going on in the circuit and how I plan to wire it:

Here’s photos of everything wired up.

Box A:


Box B:

The light box will be wired exactly as it was originally except this time I’ll use a different/new dimmer bypass.

If all goes well when I turn the power on, then I’ll do this:

This time I’ll use a different/new Aux switch.

Are we on the same page? This should all 100% work right?