It was very interesting...I'd like to have been there...not to pour on cold water or scorn...just to see it first hand. Would your friend object to you posting her original drawing and jottings?....I was interested in the burial bit...(though I did find it a bit Derek Acorah in its vagueness, even if a skeleton was to be found there..and it was the wrong sex...and, not saying your friend would claim it but "psychics" when they get something wrong have a pat answer...'The spirits get this wrong sometimes!', 'He had feminine traits!' etc..and after all its a 50/50 chance of being right...would be a turn up if an animal was found though...lol)...However, looking at your picture...it does have a look of similar "corner tombs" in Brittany, where it is suggested that builders of monuments are buried....only suggested mind, I heard a man tell his wife (on Le Petit Train through Carnac) that these were burials of sacrificed "builders"...much the same way that people still put a coin in the corner of a new house(a practice even Romans carried out)...I failed to manage to have a chat with the man afterwards....Sorry waffling on....
It was an interesting attempt to try something out for yourself and whether you believe it or not it still had some interesting results and the original jottings would be equally interesting.