The top left pretty clearly refers to
The top right seems likely to be
If we apply that to the given 5x5 grid, every other letter is valid. With the invalid letters colored red, we get:
Now, turning to the numbers:
One final note:
This was a good puzzle! It took me awhile to figure out BKKPQR. I'd tried googling it to no avail. Could ...
Partial Solve, original solution had errors, I have proposed answers for two of the three questions, but no idea on the third.
If we map the numbers to the squares they lie on, we get the string:
The "A B C D" maps to the following:
On to the questions:
What is the meaning of the black line near the bottom-left corner of the image below?
Wrap-up: The Making Of A Puzzling Easter Egg Hunt
This is not a solution to the puzzle, but provides notes from its poser. This type of answer has been approved by the community.
Caution: This post may contain spoilers.
Cryptic crosswords are not everybody's friend... Around ten years ago they were the kind of puzzle I would skip over in a ...
EDIT NO 2
Just realised this is the wrong answer. I had confused the middle square rule to the normal rule for removing only the first letter to the odd numbered letters. Sorry for that. If I get it again I will post another answer.
I have a feeling the bird hidden in the square is:
Reasoning ( please be aware that I worked backwards):
Now, we start ...