That would be Fantastic!!
I really want a Bag up there mainly because I wear glasses and need to switch between the riding glasses and non-riding.. It also would be nice for other things such as MP3 Player and garage door remote.
Since you've got the Garage Door opener issue resolved let me see if I can give an alternative for the glasses:
http://www.harley-davidson.com/gma/gma_product.jsp?PRODUCT%3C%3Eprd_id=845524448769600&FOLDER%3C%3Efolder_id=2534374309149290&ASSORTMENT%3C%3East_id=2534374309149290&bmUID=1225310756628&bmLocale=en_USI saw in your pic that you have the lowers on the bike yet. I do too and I put these glove box door covers on my bike and I keep the sun glasses in one and the night glasses in the other. They velcro down tight so they don't fall out or slide around and the inside of the pocket is a soft material so they don't scratch like they did when I kept them in my windshield bag. In fact after adding these, I stopped using the windhsield bag and never transferred it onto my CUSE3 when I bought it. It's a breeze to reach down and switch, even when in motion. And as a bonus I can keep the cell phone in the empty one, and plug it into the cigarette lighter without any problem.
There are some disadvantaged, just to give you all the facts. A) they do get wet when it rains or if I hose wash it (almost never do I do that). B) they're out in the open where they can get stollen, so if you're using a really expensive set of glasses and you're parking some where questionable you'd want to drop them in the TP before leaving the bike. That's true of the Windshield bag too, but they're more visable on the Glove Box door.
Hope that helps.
Ride Safe,
J-Carr