How were the bunk beds finished? What species of wood was used? Type of stain(s), color(s), manufacturer(s), etc.?

We're about to start our next house, and I would LOVE to finish the kitchen island similar to your bunk beds!

Thanks!

[We also live in West MI (GR), my husband is a carpenter and licensed builder (not a competitor, I promise) and he custom builds all the cabinets for our personal homes.]