I built this using the plans from here as a base and then made some alterations and added things i saw from different builds and added my taste to a few things.
Shou sugi ban burning of the pine roof and then a cherry stain. I added much more trim than the original plans called for. I put baseboard and trim in each sections of every room. This added about 30 hours to the build. Then the difficulty trying to use painters tape on such small trim. Took about another 5 hours. I used birch plywood with the intention of staining but only decided to stain the outside and the floors and then polyurethaned the floors to look like hardwood floors. Touch lights added to each room. Each room was primed white and then painted a different color per the kids request. We spent about 700$ on the nicer plywood and all supplies when all was said and done. Another $300 to furnish the rooms. I would estimate over a hundred hours spent over four months of work on this project.