I am building a map of the local universe for my story and for the time being I will base it on the real universe and our current understandings and observations although later will likely change the names and possibly locations if the story needs it.
The map will span to from local stars and galaxies to galaxy clusters and supercluster within around 1 billion lightyears. The problem with all current maps is the large missing segments due to the "zone of avoidance" and those areas being obscured by our own galaxy.
How should these areas be treated when designing a galaxy/galaxy cluster map? I could take artistic licence and just place galaxies where I need them, if it makes sense them being there or roughly repeating known areas but is there a better way to design these missing areas? are there any predictions for these areas?
Edit: The area I am interested in for the short term is within 10 million light years, it is thought that our local group of galaxies and surrounding groups are in a void surrounded by the rest of the laniakea supercluster and surrounding clusters so i am less worried for the time being of the obscurred areas between them but the areas between the Maffei group and sculptor group is of particular interest as Andromeda is in this direction and between N5128 (centauras A group) and Canes 1 group although this area seems to join the centaurus group to the Virgo cluster.
Edit 2: To make the question more specific as galaxy placement is a bit vague, Supermassive black holes are of interest in my story. within 11 ish million lightyears we have 5 smbhs, Milky Way, Andromeda, Centaurus A, M81 and M82.
Can we predict if any galaxies with a supermassive blackhole can be within 15 to 20 million light years but more specifically within around 11 million light years in those obscured areas?