That Magnum can fold for transport I think?
The trike can fold. I have not tried yet. The motor mount may fall ahead of the cross-members, but I suspect instead I will need to remove the motor to fold.
I agree an IGH would offer advantages, and it could work with this set up. I did decide that the possibility of enclosing the cluster and derailleur was good enough to get me what I wanted, although it was a gamble. That's down the road, but seems feasible now I have the concrete implementation working.
I'm in Perth, Australia. All the states and territories here have adopted European style electric bicycle rules - power cuts out over 25km/h, no more than 250w, throttle only to start moving from stopped and not past 6km/h (in some states), max 10km/h on footpaths. I can configure this in the Grin CA, (and just plain ride sensibly) so I'm legal on the road here. Off-road I can use the full power. The consequence is that I have another reason not to aim for speed - if I behave politely on the roads and paths, no one will bother me. But I have too much invested, and gain too much from this, to risk having it taken away. Off-road I can use the power, and on the road I can still go 50km/h+ if I can pedal that fast, or on a long downhill (which happens).
Here, a throttle-controlled 'bicycle' is classed as an electric motorcycle even if it has working pedals. Using it on the road requires passing all the laws that apply and getting insurance. I want to stay in the actual bicycle space, as an electric bicycle doesn't require that.
As time goes on, I expect the electric bicycle laws here to change, but I still don't see a good reason for me to go faster than a healthy person on a non-electric bicycle can go. I do look forward to relaxing the power limits to facilitate cargo loads, though. I'm still working on the gearing for this - I can use a few more ratios below what it can do now - 18.8 gear inches.