Very very interesting design. Lots of somewhat surprising things! In particular, TSSOP flash was a little unexpected... I don't suppose you guys still have one around to try ripping the flash off of to see if there are BGA landings under there?

Other aggressively cost-reduced NAND consumers (i.e., USB thumb drives and SD cards) often have landings for both BGA and TSSOP flashes so that they can quickly change to whatever the cheapest source of NAND flash is that day without having to spin a new SKU of their board... would be interesting to know if Google did the same here.