Congrats on being the first to post a map for the Master Chief Collection for the site! You just won an episode of Halo Legends "The Package". Check your PM for details. As for the map, Im not too fond of this Nebula canvas. It makes all of the pieces look like mudd due to the lighting. You end up compensating for this by placing lights on the map and the central atrium reminds me of a mardi gras festival. I mean that in a good way.
There is unfortunately no online file browser for the game right now, so there are no download links available. If you want to download a map, you need to add the forger as a friend. Then you can access their file share either through the in-game 'roster', or from the campaign leaderboard (assuming the person has completed a campaign mission). To my knowledge, 343 has not yet made any statement about when or if this will change.