I've been searching for a modest powered eBike solution with a TQ sensor. I really wanted the Bafang H400 gear reduction rear hub as shown here: Bafang H400 Solution
But there are no North American vendors of this system that I can find ... As you may notice it includes a torque sensor. They also have a nice sleek FOC Sine Wave controller (CR S.101.500 SN) that looks like this:

I especially like the cabling arrangement, two on each end. Mounted on the front of a seat tube it would allow a pretty uncluttered cabling arrangement. But since I can't get that ...

I read a review for the Tong Shen mid-drive based around their TQ sensor that you can read here: TSDZ2 mid-drive TQ sensing So I'll get most of what I wanted - TQ sensing PAS with modest power consumption. Not a rear hub, but that's OK for now. If my wife rides it and likes it, I'll move it to her bike and go for the rear hub if someone starts selling it ...

I see pieces of it here and there. The motor is easy to come by. The Bafang controller might be one Luna is selling (currently out of stock). The Bafang TQ sensor is nowhere to be found. I really wanted a common OEM style solution. But it might take me a few builds to get there ... SP

Sounds exciting. I bought a 48V TSDZ2 with VLDC5 option plus throttle last summer, but with no bike for it, I didn't open the box until today, inspired by your post. I suppose I will eat the cost if something is wrong, but everything was in the box, except instructions.

In case you need them.
Install: https://wooshbikes.co.uk/manuals/TSDZ2.pdf
Display: https://wooshbikes.co.uk/manuals/VLCD5.pdf

Mine came with a wrench. Yay! I think your wish for simpler cabling will be satisified. The brake levers and throttle plug into the back of the LCD. That has a connector for the display buttons. Cables to the motor are (1) Display, (2) Power (3) speed sensor. On the latter, mine has an extra plug that can be attached to lights (cable for it furnished).

I found the supplied brake levers to be among the better ones that I've seen on chinese bike kits. No wiggle/wobble. As I mentioned earlier, the brakes plug into the display. I found it might take a lot of force, so I won't do that til install time.

I bought it early to avoid the potential tariffs, but I'm not sure any would have been assessed. PSWpower still sells it for $355 shipped, and they're not responsible for paying them.

Unlike the BBS02, the crank gear has some internal gears dragging on it that I can feel when turning it by hand. Hope to find a bike for it soon.

Thanks for the PDF's

Don't know your biking needs, but I'm kitting out a Specialized Hardrock Sport. Pretty beefy frame w/o being unduly heavy (aluminum). I ditched the oem 6 lb RST clunker fork for a nice used Manitou dual air at just over 1/2 the weight. I wanted a suspended fork because moving at eBike speeds, even moderate ones, a rider can encounter pavement heaves and pot holes that can be jarring w/o some help soaking it up ... Added a spring seat post to help with rear bumps.

I installed Schwalbe "white walls" with the rear being a Fat Frank (2.35). Since the motor will be doing some of the work, I can run reduced tire pressures for a more cushy ride. I wanted those big reflective white stripes so that others can see me easily side on, especially at dusk. The chassis has lots of room for tire selection

Point being, there are very good candidates in the used bike market. Chassis that can easily accommodate motor fitment and battery placement. Look around, you'll find something worthy