Update to the cathedral, I've done a little bit of work on the interior decor and placed some enormous windows to let in the light, and I've gotten the shape down for all of the roof save the back. Now I just need to think of something interesting to do with it... My bet is it's going to have something to do with glass. Lots and lots of glass.
My eventual plan is, once I'm done making the cathedral and its surrounding courtyard+walls, to save it as a schematic using WorldEdit and then transferring it into a normal MC save. When it's in there, I'll put it on top of an enormous floating island with water and lava waterfalls flowing off it (through the cathedral) over a massive lake. Try to find a texture pack that truly compliments it, and admire it in all its glory. After which, backup the save file and then uninstall Minecraft. (Not really, but it would be a pretty neat touch.)
If I may give some advice: You need a lot more details. the little things. especially on the cathedral itself it's very boxy and plain. While it's a pretty good structure you need more to make it pop. If you catch my drift. I do a lot of building in MC (well not recently because my group is SOOO FUCKING SLOW) and from what i've seen that's pretty undetailed.
However, don't get the impression I think it's bad! It's very good, it's got all the right ideas. It just needs STUFF to fill in the big empty spaces of... other stuff. That of course it my opinion, you may feel differently!
EDIT: if you ever need help, I HAVE THE URGE TO BUILD SO BAD *sobs*