Exploded diagrams indicate this is completely different from the T3. It has an in-board shift cable (does not go out the end of the axle) and shifts "backwards" (a broken cable would put the hub in LOW gear like the old Sturmey "X" hub, not high gear like the S-A AW, Shimano and SRAM's own T3). OLDs are 130 for freewheel and coaster, 135 for the disc brake version, and from the diagrams (I've not seen a real one, sorry) it appears there is not much scope for narrowing the OLD on these. The iM3 design doesn't not require any special tools for dis/re-assembly. The iMotion3 coaster version uses the historic Sachs Torpedo roller actuation brake.
tcs