[kehstr]

The rear window is reasonably easy to pull without breaking, but the windshield you pretty much HAVE to break to get out, especially where this one has the trim around it. I would recommend pulling it, you will get a better-finished product around that area, and windshields are reasonably priced. Not to mention if you try to mask it off, you run the risk of the masking paper coming off and the blasting material will either ruin your windshield or the trim around it.
One nice thing if you tear up the floor sheeting, is it will make it that much easier to switch to a high hump trans tunnel. Which would help give you quite a bit more room for the trans. Plus you can never truly tell how well the past owner did in their work until you tear that sheeting up.