Stumbled with this option online:
Size seems manageable, price wise seems similar to what I had in mind. Will the Shafts be an issue? Should I go for the limited slip diff? Using this system with other components non SWINDON could be challenging?
That looks like a nice package. Not much different from typical salvaged EV drive units in design and performance, but potentially easier to work with... but that's why they need to describe inverter options and support use of any aftermarket inverter/controller, as well as to document the axle outputs and support the use of various inner CV joints. It's a lot of money compared to a salvaged unit if you are stuck with their controller and it isn't easy to use, and if you are required to custom-build axles.
It's unlikely that Swindon builds any of this - they have presumably just contracted with a motor supplier and a gearbox supplier (and an inverter supplier), but that is useful to the DIY builder if it makes it possible to buy one of each at a reasonable price, since most of these products are only available in production quantities.
I haven't checked the dimensions against the Leaf unit, but I assume it's a reasonable size. It also has substantially lower torque but the same power, which means that it doesn't produce the rated 80 kW until about 5600 rpm - twice the motor speed of the Leaf motor, because it has half the rated torque. That's okay for a small car such as the classic Mini, but anyone considering it for another application needs to think about that. It can't run any faster than a Leaf motor, so simply choosing the higher gear reduction ratio is not a solution if you need to achieve highway speeds.
See if you can get a subframe and axles, too...They build these things (but charge six digits):
I just got confirmation they will be selling shafts and a subframe.
There's the problem: they probably have no intention of actually selling any of these, other than as part of a complete conversion. Since they have the parts (to do the conversion), they threw together a marketing brochure for them, in case they might sell a few that way. If you need to use their shafts then they (and their cost) should be considered as part of the package, and the drive unit isn't as useful for other vehicles.