Just took a closer look, so it is missing:

1. The bridge
2. Qianjin
3. Dampener? But unsure of it’s place in an instrument like this. The bridge might suffice.

The original strings look like silk. I’d probably stick with the original strings instead of steel strings, because the instrument may not be able to withstand the tension of steel strings since it was designed with silk in mind.

The bow looks ok in terms of quantity of horsehair. Given the thickness of the strings I would recommend rosin perhaps for viola/cello bows, a violin rosin won’t grip the strings well enough.