The rear door is totally wrong for a JD 510 baler to put mesh wrap on. You can find GOOD JD 535s with mesh wrap for less than you would pay to put mesh wrap on a JD 510 baler.
Like Roger stated. The feed belt on the bottom is going to make getting the mesh on the bottom of the bale just about impossible.
If you want to spend a lot of money and effort you can make anything fit anything with enough messing around. Then after you are done it would have a baler that would not be worth a fraction of what you have in the JD 510.