What is it you're looking for and why are you targeting this goal? Is it to drop bodyfat or gain muscle. Are you a strength athlete? Are you looking for just improved health or is it aesthetics you're after? And probably most important for
losing bodyfat you must address your diet. The workout is a necessary evil but is secondary to diet for fat loss.
These are a few questions you should look to answer.
As far as a single body part per day, I think you can do just fine.
If it were me, I'd do my cardio after my
weight training it does help with fat loss. Glycogen stores are depleted so you can tap into fat stores almost immediately.
I'll keep looking at this thread to see if I can help.
shane