First of all, thank you so much for commentin. You have no idea how happy it made me to see this!

As for your question, Why Maglor hadn't seen Mae already is because of two things. The first is that, while it is only hinted at slightly in the fic, the idea I had in mind is that it has been a LONG time since Maglor cast the Silmaril into the sea. It was definitely past the 3rd age when Maglor arrived in Mandos. Therefore, it is unlikely that Maedhros was still there, but even if he was, in my headcanon when an elf first arrives in Mandos he is not immediately put out into the "group area" if that makes sense, and is instead given some time where he is alone, to sort out himself so to speak. As far as I know this is neither supported nor rejected by canon, but it is what happens in the version of Mandos's halls that exists in this fic.

I hope that explains things! Honestly, I played around with a few different ideas but this is the one I decided on. It's fairly ambiguous in the actual fic, and is left somewhat open to interpretation.

I really love your writing Himring, and am honored that you enjoyed mine!

Yes, I really wanted to combine his HoME fate with the one in the published Silm, and I thought this would be a good way to do that, both because it gives him that "symmetry" with Maedhros, and also fitting really well with my interpretation of his character. 

I had to give them some form of a happy ending(although I'm not sure how much I believe in its canon likely-hood)! It came out as a sort of "life can find a way to begin again", which is part of the idea that "roads go ever on", which in my opinion is one of the central themes of Tolkien's  legendarium. The truth is I didn't think about any of that while writing, while I was writing I just wrote, and it is only now that I'm replying to your comment that I think about any significance to what I wrote😂.

I'm glad that you enjoyed it. I feel it is in character too. I wanted to have Maglor survive the longest, but in a sort of empty, half alive state. Alive but not really living, as the endless years pass him by. "Timeless limbo" is a good way to describe it...