OP, are there any parts on the bottom? The side picture has the headers hiding the bottom. Going by the schematic it looks like U3 is on the bottom. The reas

OP, are there any parts on the bottom? The side picture has the headers hiding the bottom. Going by the schematic it looks like U3 is on the bottom. The reason I was wondering is that without the headers it would be easy to solder it to another pcb like a module. Very cool though, I hope it's a big hit.