Geez Tom! Tiger Tank?!! Now you've done it!
I expect Greybeard will be giving us all a full page recitation about a certain WWII German military vehicle, any time now!

Okay....sorry!
Now, there have been a number of guys here who have bobbed their rear fenders which, as Friar John said, IS steel.
Check out the "Custom Bikes" section on this site for details.

Cheers,
Dwight