Good info, Steve. I appreciate it!
With the headboard, I was just going to put the foundation up against the wall (my current room is very small). If I had a master bedroom, I'd definitely have a headboard.
As for plywood, any recommendations? Again, I guess I'm just a little curious how this will all hold up since the height is 27" and the length is 82". Should I put in another support in the middle? Since the "cabinets" will be rather tall, I'll probably put some shelving in the middle in one or two spots but again, was curious about having another support for each "cabinet".
Thank you for any further help!