All Classified forums require a Site Supporter subscription. It is only $25 per year and you can buy and sell whatever you like on the forum. To become a Site Supporter, go to Your Profile and select "Paid Subscriptions."
I think they face the way they do to keep the float near the center of the liquid mass so the "slosh" effect is minimized.
I reckon you'd have to have pretty "mad skills" to cut out the fuel filler door panel and move IT to the other side rather than move the tank, huh?
Not worth the trouble, unless you REALLY like body work, IMO. But I'd bet it wouldn't require "mad skills," just plain old-fashion skills would probably do.