I want to know how-to fabricate sheet metal?

it's an art, it takes years of experience to make it look good and fit right. most metal is stamped out these days but there are guys who can hand form stuff still. no video for this, just years of learning and trying.

They used to teach metal shop in Junior high school. There used to be Junior high school. What dahell is "middle school"? Metal fabrication is more complicared than just taking some sheet metal and sticking pieces together. Yes, an entire curriculum is necessary to learn what you're asking for. There is no video long enough to get you waht you asked for.

Another option sometimes is body filler or fiberglass work. Another option sometimes is to get a new used part from a junk yard. Get a price quote delivered to your local junk yard at http://www.car-parts.com/ or http://www.junkyarddog.com/