Oh, you've never shown him, so you have no idea if he even IS show quality. Only one way to find out.
Are you talking about conformation and/or performance?
I wish you luck. It's a long road to championship - tons of work and very expensive. Will you handle him yourself? Are you training him for show now?
Has any expert given you an opinion on his chances in the ring? Who told you he is too lean for showing? Judges certainly don't expect puppies to be as beefed up as 5 year old dogs. They are looking for bone and movement and conformation as a whole.
I'm sure all of us would be interested in following his career.