I'm still kind of just staring at the sketch, wondering how things would fit together.

I have a cool idea which is to have the top cover kind of just curve around the top of the motor which just so happens to look and feel premium enough to keep it uncovered. (Perhaps, if someone is so inclined, this Tetrinsic could be used both as a slider and knob.) I'm visualising something similar to those "black-background car side" pics. I'm also thinking of mounting the motor using a grub screw; if those things can hold an FFF 3D printer extruder gear in place, it should be able to hold the motor in a fixed position. If successful, that would further cut down on the amount of additional tools needed to manufacture this.

I think a PCB solution could exist where the screen and motor flat cables could be soldered directly on. 

It still seems like I need to consider a conceptual #Tetent TimerSpy [gd0136] solution for design questions like "how should Tetrinsic be mounted?", so I updated the file:

I don't think I'm going to be able to get a solution that has Thumb1. That's ok though, as I still consider a 4-finger Tetent a fully featured one. Additionally, I'm thinking of having the Tetrinsics slide out (using the help of springs) so that TimerSpy is compact enough to fit on the back of the hand. This means that the fingers have slightly different elevations, and Finger5 is much higher than the rest.

I stacked some magazines up to test, and it seems that my hand doesn't complain with the height difference. It does complain if it's the other way around. This also helps with keeping TimerSpy thin when on the back of the hand, and has the benefit of slightly tilting the main screen towards my eyes.

The height difference between Finger5 and 4 is only 8mm though, It looked way larger and I tested maybe a 20mm difference..

The minimum gap is 1.1mm due to 20.5mm finger spacing (which I think is fine) and the entire width between Finger2-5 is 86.4mm, which should be ok for wearability. At that size, it's likely that TimerSpy would keep the 3.81" 90Hz AMOLED screen over the 2.9" 120Hz LCD planned to be used in #T^2 TyMist [gd0138]. If I can get the base length down to about 70mm (currently 75mm), I could have a nice, thin bezel.