@ANerd-I It looks really good! The exterior looks fine how it is imo, add lighting maybe? I would only really request a way to get up to the roof (spiral staircase in a turret?).
You can take any of my netherrack/nether brick btw, looks like a lot will be needed
I googled images of wireframes in Minecraft, and it looks like everything is square/rectangular. Probably worth noting that Minecraft is based on voxels, not surfaces like most games.
I even looked at torches, but even there, all the particles are square and the torch flame itself is composed of rectangular pieces. It's also a sprite, not a 3D object.