Yep! :)

Here's a quick video showing the patcher sewing through a few different thickness of leather.  I also cover the needles I'm using, since they are a bit non-standard.

The leather I tested on was probably ~4oz oil-tanned pullup leather.  The second test was 4 layers totaling about 8mm of thickness.  The leather is moderately supple...not super tough, but not super limp either.  I should have grabbed a few pieces of thick tooling leather but didn't think about it at the time, sorry :(

Test thread is #69 polyester, needle is 134-35 / DP-35 LR chisel point in size 120/19.  This replaces the 15x1 / Hax1 needles that come with the machine (although it does require some modification).

All in all, it works great!  I still need to create a replacement stand/tripod and rig up a foot pedal, but that should be relatively straightforward.  Going to declare this project a success!