[Postsedan]

IMO, Legendary makes the best reproduction door panels.....but there is a learning curve.
The panels are much thicker than that of original GM door panels.
Therefore....if you move the panel closer to the kick panel.....closing the door and adjusting the door glass makes it extremely tight....it can be very frustrating.
Based on your one picture....it does look like you have a little wiggle room to move it a bit. You will have to open the holes for the window crank and door lever a bit larger to move the panel a small bit. If you have any over hang anywhere, there will be problems and you will damage the panel.
You may also encounter a problem with with rear panel fitting too close to the door edge....be careful on the gap between the two panels....as if they rub, they will damage the material very quickly.
You are realizing how much time it takes to make this a perfect install....one needs a lot of patience for any interior install, especially in aligning all the glass....especially when you are trying for perfection....as in, wanting both sides to be exactly the same.

Good luck.

Dan