Completed my upgrade!. @gr5, below are some more photos you can use on your tutorial. I printed a clip and taped it to the side to use as a wire guide. I'll wrap those wires and use some proper supports later.
I also used another cord to use as a guide and installed the replacement heater in the cable wrap. I'll keep the other as a spare.
I learned a lot along the way. First thing I should have done is remove the filament. I wound up with broken filament in the feeder and what I now know is the PTFE coupler got clogged with PLA. Neither was too bad but I think the guide is written for someone that already knows how to build one of these from scratch.
Very happy with the shiny bottoms of my PLA and how much easier it is to release prints. ABS filament is pending available stock.
I'm having a problem with the first layer in one x,y region where it seems to bump something but just on the skirt and I'll probably go down the rabbit hole on that one next week. But the few prints I've done have been really nice. Got a case to go on my pi zero and more prints planned for the week.
Here's the album: https://goo.gl/photos/h6kDn3MDKGkg3mqR6