The problem with the map is that Genesis9 didn't put the downloaded meshes into a new group. They put them into the default groups casing most of the objects to be invisible to the players.
Genesis9, when uploading objects into the object maker be sure to make your own your groups. To do that all you have to do if type in "whateveryouwantthegroupnametobe* in the box where it says, "Group" below, "Name".
(so that you can see what I mean)
You might know this already but I hope I could be of help and aren't annoying you with somthing you already know. ^3^ Just trying to help you out. It really is beautiful map, I wish I was able to explore it and see all the objects. :c