it's a pretty cool cathedral. the exterior has a damn nice overall concept and design
although, i think that is a bit over detailed
the interior is very nice, grand and simplistic
although, it may be a bit too open, which reveals A LOT of the tiled floors. (it isn't very pleasing for the eye to look at that repeated pattern, especially when the tiles have contrasting colours) I understand that it's still a WIP though, and i suggest that you fill up all that empty space with not just benches, but maybe rooms and hallways too or stuff like that, just so you don't have too much of the tiles showing.
people will probably go crazy over my "over detailed" comment with some kind of argument such as how cathedrals are supposed to be detailed.
my response to that is that there's too simple, simple, detailed, and over detailed. Cathedrals are certainly detailed, and if you Google search them, you will find some cathedrals that are detailed, and other cathedrals which are over-detailed. I personally think the over-detailed ones look very unappealing. There's just too much detail that it makes it look messy. That kind of stuff is more appealing to craftsmen, who look at the small things and how they were made.