Great rendering! Really liked the tile work and countertop/fixtures. Didn't like the color/wood of the cabinets and the door isn't the same style as what exists today (we can change the color / stain - but not the panel style).
Also - the drawings weren't complete (ie what are the dimensions of the seat) - I didn't see an elevation drawing. It also seemed the parts list wasn't complete (what is that shower unit)? The ceiling needs to be tiled for a steamroom as well as the glass door should have gone all the way up to the ceiling.
The buildability issue is that I don't think this is a document that I can just hand over to a contractor for a bid. Especially since the steam shower isn't complete, the parts list isn't complete and all the build specifications isn't quite there.
Also moving the toilet and adding 1 window (rather than making the existing window smaller) probably adds another $2K+ to the project.