A cool idea that probably won't work.

I already posted this on the SSI group, in the thread with the glass v
acrylic, but decided that it should have a thread of its own... if
only to get shot down. I'm not exactly going to be shocked if there
is some basic problem with this. But anyway, here it is:

Maybe there are some VVD fans here who can ponder this weird idea I've
gotten.

If I deposit vapors of both aluminum and oxygen together, will I be
depositing sapphire? If not, is there anything I can do to my vacuum
vapor depositing maching, or to the vapor it deposits, so that it IS
depositing sapphire? I occurs to me that sapphire might be a wonderful
material for certain uses, such as windows.

What about this: deposit multiple layers of sapphire, until it is
about ten microns thick, then wrap the structure (I'll assume a
Stanford Torus spoke) in a ten micron diametre strand of anhydrous
glass. Wind it tight, and go over it again with the VVD machine until
you've built up another ten microns of sapphire, then wind it tight
with...

Do this until you have a ten centimetre thick shell. Then put a
millimetre thick coating of regular aluminum on the inside and outside
surfaces. Or maybe not. Hey, would this composite glass/sapphire
material be transparant?