All done in Unreal 4.13, using the HTC Vive. Will try and put together some instructions for how to do the more complicated bits like the maths for lining up a room scam with your actual physical space in a little bit - and hopefully will also figure something out for uploading the project and letting anyone that's curious pick it apart and see how it works. Will have to clean it up for that first though!
Credits for the assets used:
https://sketchfab.com/models/993f6d456a434490b7ad3b9456b97a19 Hrusov Castle by R0m1R
https://sketchfab.com/models/3a90c91cd8e84cfabffd38f95ac8786b Cloisters 2 by Paul
https://grabcad.com/library/stargate-2 by Szabolcs Bognár
This is the scan of my room that you can try on Destinations if you have an HMD: http://steamcommunity.com/sharedfiles/filedetails/?id=700725913