This was a pretty straightforward project. The building itself was simple and quick, although the sanding and paint took a while. I wish I had sanded before putting the boards together to make a cleaner look. The bolts had to be awkwardly close to the edge to avoid the 2x6s on the headboard and footboard, but it ended up working ok with some serious pre-drilling. I used 9 1x3 slats to create the platform for each mattress (18 total). It would probably be better with 12 so they are closer together.
Overall, the bunk bed is super sturdy (and heavy!) and the kids LOVE it.