It looks awesome, if you are good with a torch, you may want to try silver brazing. Its low heat and is 60k psi tensile strength. I am not a fan of mig for real precise work.

What are you going to use for a seal to the hood? I have some rubber product that is 3" wide and come is a roll that you could fasten...or look for a P seal

http://www.brownaircraft.com/product-p/t-6400.htm
Tim

1941 Taylorcraft
1968 Charger
1994 Wrangler
1998 Wrangler
2008 Kia Rio
2017 Jetta

I didn't do 4 years and 9 months of Graduate School to be called Mister!