Through the Looking Glass [WIP]
Well, yeah. The metal walls would be better if divided into more sections covered by the larger metal texture versions, and some blocks sticking out of the walls are generally a nice touch. Also you can put some wall lights into holes of metal walls so the room does not look like illuminated from nowhere. You have to just experiment a lot.
Also the concrete textures have more variations. You can also use an overlay to make the concrete wall dirty from leaking-in water. Just go ahead with your fantasy 
Btw. do the rooms really need to be that large?
About areaportals - put a thin (1 point) brush into your hallway connecting two parts of your map, covering the WHOLE sight. Also there must be no other way between the rooms. Cover the thin brush with tools/areaportal. More about areaportals on Valve Developer Wiki. 
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There really is not a lot of use for areaportals in a Portal map, unless you have several very large areas that are nearby eachother. Incorrectly using or over using areaportals, like many other optimization techniques, can be worse for your map rather than better.
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I tried putting in two area portals just to test it out, but when I used mat_wireframe 1, they clearly were not actually blocking anything, even when they should be
So I guess I should just forget about it and not bother.
Now I just need to figure out how to make nice looking metal
Just make the metal walls different sizes and have some of them stick out.
When I finish all the metal walls, should I upload the new version? In the WIP process, how many and how often are new versions typically uploaded?
That really is entirely up to you. I myself never release public WIPs. Some people release 2 or 3, and others who can't live without the approval of others release dozens. Your answer may be different.
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I've been trying to fix all of the misaligned textures I could find; however, I have a problem. Some of my brushes aren't an even multiple of the texture size, so no matter how I align it, there's always a bit left over at the edge. What should I do?
Always make your walls a multiple of, say, 128 (or whatever the texture size is). So you will get a nice-looking wall with no misaligned textures.
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Make them an even multiple. What grid size are you using?
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For the most part, it's in multiples of 16 and 32
The main problem is the concrete wall texture, because anything less then 64 causes problems.