I agree with Lin, your on the right track. I got some aluminum from a boat maker last week for this very reason. Friday I cut out a pattern for a knife that has been in the planning stage for weeks, with design assistance from Lin Rhea MS.
So after work on Saturday I fired up the forge.
The first attempt came out a little short and I didn't get the Choil pulled down and back enough.The second attempt was yeilding the same result so I tried again.
Remember when you are forging to a pattern you need to forge it just a little larger, "fudge factor", as Lin calls it.
Keep hammering, your going the right way.
Chris