The electric E30 is still on FBM, now priced at $5k.
Someone on DIY Electric Car was asking about the Spark EV as a donor for a 2nd gen DSM conversion.
1) They seemed to be thinking about using the Spark motor with the DSM trans, like you would do with a Leaf's EM61 or EM57 motor. Technically the Spark's motor will unbolt from the rest of the drive unit, but the motor is NOT nicely sealed and self-contained. The output end of the Spark motor does have a bearing support (I think Teslas do not even have that), but otherwise it is open and the coolant pump is in the 'gearbox' half. Fun factoid: the drive unit is a "1ET35", GM applied their transmission naming convention as a single speed transverse.
2) Supposedly the 2014 Spark EV had a 3.17:1 "final drive" and the 2015 had 3.87:1. Either way, there is only one stage of planetary reduction so the Spark uses a low "KV" motor (low RPM per volt applied, equiv to a high turn count R/C motor). As we all know from this thread, it normally does not work to create a mid-engine AWD car by taking a FWD engine+transaxle, turning it 90deg, and connecting the halfshafts to front and rear diffs (double final drive reduction = sub-60mph top speed even with really tall tires). HOWEVER, it might actually work with the Spark drive unit if you weld up the planetary. Of course, it may be simpler/easier to use separate front and rear drive units rather than a single motor and mechanical AWD.
Real pix of a disassembled 1ET35 drive unit: https://www.adamsautoadvice.com/spark-ev-engine-and-transmission-gallery/