The bathroom actually has a huge window in it. The basement is a walkout. The window will be in shower so we're probably going to something like glass block. So, we're in pretty good shape light wise but will consider the vent+light option- thanks! We're installing a real ceiling (as opposed to drop in the other areas) and real door.
So, the glue down floor requires that you use a hairdryer to loosen the glue up then you can easily replace individual planks. It actually seems easier than replacing boards. But, still not sure on which way to go!
The bathroom will be fairly decent sized (36" vanity easily fits along with a linen closet and full sized shower- on par with a shower/ tub combo). Won't be grand but space isn't at a premium.
Pinterest and Houzz boards all done up.