As for the mount, I recomend toilet seat cover.
I don't think I would shoot the bear if I knew it was small. I can say I know how hard it is to judge bear. I have taken many bear and there are some 100 lb bear mixed in there i would have sworn were 150lb.

That being said. I am not game for shooting a cub (if I know it). But I have shot fawns bowhunting the urban zones and shot does with fawns. Lots of us would have no problem with this, but would shun the same when it comes to bear. Why is this. I honestly have no idea.