Hi Flyenemu,

I printed the first page out to give them a real "test" and I think what I'll do is leave the single doors hinged on a gridline, this means that if the door opens into a 10ft passage you just have to ensure you line up the walls on one side (see attached pic). Obviously it won't matter for 5ft passages.

Click image for larger version. 

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When cutting out the tiles the white space between the walls of the doorway will need to be cut-out.

I'd like to hear your opinion re the flagstone post...