Not knowing details about how such games work, I would expect that you would do everything within that world and its units, and wouldn't need to convert to metric. Any calculations you really need to do for the game, I'd think would be within their historical or imaginary system of units. And if you want to convert to familiar units, just in order to understand how big things are, that's fine; precision is not important.
But again, I don't know how these things work, and this doesn't really matter.
What I've tried to explain about this is that the numbers you're given are inconsistent. I'm supposing that the length of a foot is primary, and I showed that the inch would be 2.47 cm, not 2.46. You're apparently supposing that the inch is primary, and showing that the length of a foot would be 29.52 cm, not 29.6. We're both saying the same thing: that their numbers don't quite fit together. So if you want to convert accurately and not get confused, you need to pick one as the "real" conversion, and ignore the other. (Whichever unit you start with, they have erred in their rounding.)
This is not your fault, but theirs, since you didn't work out one number from the other as I initially assumed. Just don't expect exactly consistent results, and you should be able to get by.
I think we've done all the calculations you've asked about. If there's something you think is missing, please once again show your attempt, and we'll probably tell you you're right, since you've done correct calculations so far.
One more time: Your calculations have been correct, apart from the fact that the numbers you are given are not quite accurate. I think the latter is probably what is troubling you, and I want you to know that any errors you run across are (probably) their fault, and not yours.
(I was locked out of the site for an hour, as sometimes happens; and it happened again while I was adding this postscript. I wrote the above before your last message. It looks like we agree, except that 12.02 is irrelevant; 12 is the one exact number you were given. None of the "errors" are big enough to worry about, and your methods are correct. It's just the rounding that is off.)
