Nice work :-)
Now, I don't want to p*ss on your bonfire, but this may be a good time to remind those of us in the UK that the <easier> 10xMPE calculations are not accepted in the UK (as yet).
Health and safety laws in the UK are pretty stringent and whilst it's nice for us to use simplified rules there is nothing written in statute (as far as I know) that allows one to use these calculations.
It would be nice if one of our 'Guru's' could perhaps pop in at this point and clarify matters.
Quote: "There is a theory which states that if ever, for any reason, anyone discovers what exactly the Universe is for and why it is here it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another that states that this has already happened.”... Douglas Adams 1952 - 2001