Well, that wasn't as hard as i thought it would be...
I already have come up with a reasonably workable character design for the puma mobster/godfather wannabe.
Here are some sheets of really bad scribblings I made as I played with proportions and such trying to come up with the final design, sometimes getting distracted and doodling other characters instead.
In this first one, the puma's nose morphed into something very much resembling the Coyote that appears in some later Pluto cartoons.
...and on this page I finally got in the ballpark of what I wanted, by nailing down specific anatomy and defining details.
As a bonus for suffering through these bad drawings, here is a glimpse at my progress on the background painting.