I love these kinds of projects. I myself have been working off and on (mostly off π’ ), on a similar one. You can find it here http://sketchucation.com/forums/viewtopic.php?f=81%26amp;t=25162.
Anyway I applaud your endeavors and just keep at it. Sometimes the lack of information can be a big road block, especially with a building that no longer exists. Sometimes an obscure reference in a book can help tremendously, so check libraries and online university databases, or even browse amazon.com for books on the subject.
Good Luck, I'll be keeping an eye on this one. π