[Zero Hour]

It's very impressive, so far. I did a little 3D design for a short time, but it takes A LOT more effort than regular ol' 2D design.

I would suggest, for your turrets and towers that you line them with tile, otherwise it looks very nice. Most churches have stucco on the inside, or marble - I guess it really depends on where it's built.

I really admire the architecture of churches - they're always so grandiose. I like it a lot - but you should also consider (if you have the energy when you're done) making some nice stain-glass portraits for the windows, that would be a nice touch.