Well Tony there is only one way to get a hammered look........... lol, based on the pictures that you attached you could use red spot puttyinvery thin layers and sculpt it on using a painters knife (looks like a mini cement trowel). be careful using this stuff as it is laquer based and will melt the plastic if you put it on in gobbs. But thin layers it is fine, the stuff is very workable, sands very easy and has great adhesion to plastic and takes paint really good it is used for body work afterall. Okay that's it dude you have tapped me out on this hammerd surface thing.
So I suppose that you are no longer going to finish that Tiger that has been waiting patiently for you.

I Like you passion to detail and documentation witrh this build.
regards,
Ray