Indeed you could produce very detailed maps of the inside of a hotel and as long as you knew the Lat/ Long of each corner of each map tile it will work to a certain extent.
Its a heck of a lot of work to go to only to find the GPS reception inside the hotel is zero rendering all your hard work producing the maps useless. Try using the GPS in the hotels to see what reception is before you start any custom map creation - its possible but not a five minute task.
It might be possible to add your data to the Open Street Maps (OSM) project, then you will get the map tiles back and the necessary coordinates in a fairly easy way, OSM isn't difficult to use, see
Here - Mike