One thing I can suggest is to try and find/use architectural plans and the like.
Local govt. offices/websites often have resources you can access for free and there is -- one would imagine -- a veritable plethora of things like house layout plans and so forth online.
For example :
http://www.princess.com/learn/ships/ap/
has some deck plans for their ship.
edit :
also found this site bookmarked by me....err...... god knows when ?!
http://maps.stamen.com/#toner/12/37.7786/-122.3808