Deusovi and the commenting crew have already found out in which country the meeting point is. But Uncle Redbeard has also specified a seaport. We just need to "connect the dots".
(This partial answer, which really just provides the last bit, continues and spoils the work of Deusovi's answer.)
The dots ...
This is clearly a reference to ...
I think the four brothers are
The positions in the competition represent
The hands and legs refer to
I can defeat my brother only as I have double power than him, this will be evident from the fact when we will grow up 10 years older." The 2nd brother hesitates and says, "Actually, he is correct. But our heights will be the same".
I think ...
Slightly partial answer, missing the explanation for uppercase 5d.
The cipher is formed by pairing up the highlighted letters and filling up letters needed for the incorrect-case clues to make sense.
Partial answer - have country, don't have seaport
First of all:
Also, given the journal,
Now, combining the information together:
The next step likely has to do with
but I haven't quite figured out how exactly to do that yet...
Thanks to Gareth McCaughan and user39583 for help after the crossword assembly.
Nearly complete answer. I'm missing what I think is the last step.
The two unclued down entries ...
The first characters ...
The last characters ...
Is this the end?
Thanks to ...
Explanations of clues:
Explanation of other stuff:
Remaining minor gaps and gripes:
(Lest there be any doubt, I still think this crossword is a wonderful achievement, despite the gripes above.)
Credit where due: Deusovi kindly pointed out an error in my original submission, and has given me what seems like it should be a huge hint for the one bit ...
Wrap-up: The Making Of “I claim this corner of the world for Britain!” - What game are Alex and Brooke playing?
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.
I wanted to make an entry into the FTC. I've made flags puzzles ...
The original text doesn't seem to have been taken word-for-word from anything on the internet, and it seems like some gaps can be filled in multiple equally-plausible ways, so I can't guarantee I've reconstructed it exactly, but this is clearly about
Things I'm not entirely satisfied with in this answer:
I think that what Captain Clumsy is lacking is:
First of all, identify the flags:
Secondly, the acetate:
Which generates the following table:
EDIT: The flags cut out with the acetate patterns look like this: