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I've done 3x cordura (or 2x plus zip) without problems - 4 layers needed some assistance to get through (finger pressing down on the needle clamp) but I wouldn't fancy doing that if a motor was involved.
Having said that, I have a spare (and suitably vintage looking) universal motor and a foot switch for one of my lathes. It uses a Singer compatible belt as a primary drive - I might be able to lash something together...
MrE
rhb
To add, not sure how much a motor unit would cost, but if cheap I think it'd be worth a go.