Did some testing this morning and was very happy with the results with some room for improvement (I'll upload pics in a bit).

I bolted the assembly to an piece of 10mm ali. As a very quick and nasty bit of static loading I put PP3Ds 31kg disc on the end of the shaft. After a half hour the mounts were still dimensionally fine and holding onto the weight without issue.

To test dynamic shocking i made a quick and nasty wheel with a nut heated and sunk into a wheel. I then took my sledgehammer and gave it a knock from above my head. The wheel came off instantly leaving the nut which was hardly surprising. The mount however was perfectly in place. Knocks from all directions were absorbed nicely by the material until a sideways knock bend the shaft in the housing. So it looks like I'll need to add a second bearing mount to the front piece similar to what ewan had to do with the gimsons. Not the end of the world.

What i was very encouraged to see was that the nylon really seemed to absorbed the shock. The motor did move during the impact but it returned to it's original position.

I realise this is all less than scientific but it gives me confidence in the material.