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I think I've solved the ouehra bit. Well partly at least.
It's the second letters of the days of the week, like this
mOnday
tUesday
wEdnesday
tHursday
fRiday
sAturday
In this case the question mark at the end is in place of another U, for sUnday
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Perhaps the E=5 bit is telling us the value for the U of sunday?
So:
E=5
H=6
R=7
A=1
U=2
O=3
U=4 (Tuesday?)
You're definitely on to something with the days of the week though, it can't be just a coincidence that it fits.
You might be onto something with the 7x7 grid with the numbers as well. I'm going to have a go at it now.