After last night’s disaster, I’m pleased to report some good news. The straps are largely done and the watch can be worn. Even if it looks a little crude for now.
As you may be able to see, the wires are slightly exposed. I plan to fix this by attaching a cover over the top of the watch (with a hole for the LEDs and buttons) which will attach by velcro to the strap.
After that, all that is left to do is figure out how I will make the buttons accessible through the case.