First full 4x4 BLD attempt, didn't time it, the memorizing was over an hour anyway. The execution 10-15 minutes.
I spent ages burning it into my brain so I didn't forget while solving.
2 CORNERS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
The VERY LAST PIECE I inserted was inserted wrong! I must of screwed it up in the memorising process. :fp

ARRRRRRRRRRRRRRRRRRRRRRRRRRRRGGGGGGGGGG!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
How the hell could I of done that!:fp
The corners are the most easiest thing, it didn't even have parity! :fp
I memorised the incorrect corner like this:
[Shoot to BLD] (representing "M")
It should of been:
[Shoot to LBD] (representing "K')
Seriously though, :fp