OMG - he looks so HAPPY!!! He's totally enjoying himself, based on the pix. You're doing such an awesome job with him, and he's just loving it. He looks great - and is totally lucky (right?!?!) that he landed with you!
I was going to suggest the suspended sling to keep the weight off his leg, but I see that has come up already. The sling you made for him is fantastic. I just read all 33 pages to make sure Lucky was ok. I'm so glad that he's got you. Looks like your son loves him too if he's sharing his toys!