A slab of what? Concrete would be beneficial although he'd have to move up, Glass would probably be an improvement and Chocolate would be humorous.
This is a massive part of it for me. He needs a more respect for his opponents abilities and a better estimate of his own.You need to sort out his mentality. He needs to realise he isn't as good as he thinks and that his chin is vulnerable. It's all well and good correcting his technical faults but the fact that he thinks he just got caught by a lucky punch makes me think he wouldn't win a rematch if it happened. You have to train to negate your opponent's strengths, not just accentuate your own and Khan's not going to do that when he thinks he's Mr PPV fighting bums who are lucky to be in the ring with him and who occasionally get lucky.
I mean, how would you make the most of what he has now in terms of game plans, tactics and training etc.If you mean 'how can he be made into a top level fighter' or better than he already is...then you can't.