Hey Mr's. Randy and doubbletrubble, Yes the frame will be color cased ------ But after it is returned to me, I will do the following. I will set a weak solution of toilet bowl cleaner in my shop window along with the color cased parts to be warmed by the sun. Nest, I'll compact a fluffy 0000 steel wool pad into a dense pad which I'll use along with the cleaner to remove rhe color from the frame. You do this by briskly rubbing the matel with a damp pad (T.B. cleaner) to gently remove color. By doing it this way, the color comes off the surface but not out of the engraved cuts. This will leave you with a clean surface but cuts that stand out. Final step is to spread a thin coat of real dirt crank case oil from a diesel engine. Something about it alows the steel to take on a slightly grey cast as in aged --- but I still have a cased frame.
For the rest of y'all, you got to know if the road kill is fresh enough we Carolinians will first BBQ it before copying the critter on steel. Might even marinate it first in some of that oil for flavor.