If your well seasoned or just starting out with metal forming then click on over to www.metalmeet.com
A place dedicated to the craft supported by thousands of members all over the world, a site with thousands of threads relating to all things metal.
The link below is a great example of the knowledge available and what lengths the guys go to in helping you solve any questions you might have. http://www.metalmeet.com/forum/showthread.php?p=112637#post112637
Finally started to get serious with the Fast back, months of pondering and visualising can be unleashed using the English Wheel, mallets and tin snips, oh, I forgot to mention masking tape and card board! If your thinking of doing something similar and your a newbie like me, take your time in creating a accurate template and studying where stretching and shrinking needs to happen.
Iam not too sure what order the pics will load but you will see, masking tape template which is transferred to card board then cut out, the template sliced to allow it to go from 3 dimensional to 2D so it lays flat on Aluminium and traced around.
Lots of wheeling and fitting to get the overall shape which Iam fairly happy with, still plenty to do and will post pics once I cut out the seat pan and radius the edge.