[JesseK]

That latch! Wow! How hard was it to balance the push-up force from below versus the cylinder's resistance, only to need to use the retraction stroke to then lift the entire stack in order to set it down? Was this accomplished via specific prototyping, calculations, a bit of both?

I also see an axle linking the front/rear latches on either side. Were there any issues with the left/right sets not firing at the same time, and if so what eventually solved it?

What are the 2 pieces hanging off the bottom of the claw for?

The long skinny horizontal cylinders that run front-back didn't seem to import correctly. Are they for pushing the tote stack out of the bot?

There are some really great nuggets of wisdom in the details of this CAD - from the nifty sheet metal carriage all the way down to the idler sprocket assembly design. I dunno how I would approach a rear-leaning tower without sheet metal though. It's a really neat design.