That looks like Greg King's and Penny Wilson's, which BobG posted a link to earlier in this thread. Most unfortunately though, these floor plans are not quite right. This isn't a criticism, just an observation. Penny herself even mentioned when she first posted the link to them that they are "based on a number of plans drawn by friends who have visited and on other materials, and may be somewhat different to the actual plans..." And so they are.
To my limited knowledge, the only actual plan to surface so far is the ground floor. Since this copy is so frustratingly small ...