Gas Storage in Orbit

I've been wondering where we're going to store all of the atmosphere
for a habitat while it's being built.

It doesn't make sense to me to complete the structure of the habitat
and then go and refine material to extract the gases for the
habitat's atmosphere, all the while venting the gases from the
construction process.

I got to thinking about how to build up an atmosphere in the most
efficeint way and would like some feedback from members if they can
point out conceptual flaws and can provide engineering details.

First off we make a very flimsy wire framework of the Habitat. Then
cover it with mylar. Then starting spraying metal on it via vacuum
vapor depostion. Once we have a gas tight shell, with a wall
thickness of (this is where some expert help would be most
appreciated) half a millimeter, we start pumping our waste oxygen
and other needed gases into the Habitat. The gas pressure of the
atmosphere should always be less than the structural strength of the
habitat shell.

Meanwhile, we keep adding more thickness to the shell, thus allowing
more gas pressure to be held.

Now for some Habitat designs the windows issue will not allow this
approach, but the modified cylindrical design that I've already
outlined in this group does allow for this approach.

So other than the windows issue, can anybody supply feedback on this
proposal.

Thanks, TangoMan