I've started some work on this idea, trying to collate various bits of info, going through that Lulu site and also playing with formatting.
One of the big questions that would need to be sorted out would be as regards the format.
Lulu produce several formats of which I think one of these (the two smallest) would be best:
Pocket= 4.25" x 6.875"
A5 = 5.833" x 8.264"
it would almost undoubtably be black and white as colour more than trebles the cost (up over the £20 mark) and isn't available in pocket format
The fonts involved, as with most diaries, would be pretty small. If not then the book could become rather thick.
There's one more formatting question- which format would people prefer?
-To have the extra information (hunting seasons, astronomical events) at the beginning in a series of tables and then have a week at a time on view with less info
-To have no extra tables but then have 1 or 2 days per page with the information included there.
I'm leaning towards the first option and the pocket size simply to keep the size of the book low and the utility of it high.