Effectively two feet after allowing for one rib of overlap.
No. At least, not in any stores around me.
Home Depot doesn't sell 36 inch wide utility grade corrugated metal panels. You have to switch to their thicker gauge roofing panels to get that width (at, of course, a higher cost).
I suspect the shears will not cut 'across' the corregation without deforming. I used a metal cutting blade in a circular saw. It worked very well. As for using as a backsplash. The metal will eventually lose it's 'shine'. Sealing it to the countertop will be challenging. The depth of corregation will intrude on the countertop. I don't think this is a very good idea unless maybe you are talking about a rustic cabin or barn-like situation.
I don't think they will. I've cut mine with tin snips without any problems
They are normally 26" wide to allow for overlap with an actual coverage area of 24"
25.75 in wide and take into consideration you need to overlap at least one ridge on both sides and I overlap one ridge even on the outer edge of the roof.
Yes. It is plated though so if it gets very hot it will probably discolor.
not 100% sure about color, but I think not. I cut all mine would tin snips
Unless you have or have access to a slip roller I can not picture being able to bend the panels round with out kinking them. You could take 2 panels or 1 panel ripped down and make an ovel with out mutch trouble