Alt. Ratbat - ideas / discussion?

After completing about seven custom Alts in four weeks, I was afraid I was going to run out of ideas once I reached the end. Nope!
Started looking at the GT mold with a kitbasher's eye for the first time. I noticed this area just behind the shoulder marked with a red circle. If that could be sanded away, the arm could fold all the way back and the car sides could hang down instead of out to the back.
Basically, they would look like wings folded down, and could still flay up and outwards.
Has anyone tried to modify the arms on the GT like that? I'm not sure if it would affect the car mode. Even if it did, the unaltered arms still resemble wings folded down.
Painted purple, the mold could be complemented by a Ratbat persona, which is the other reason for my post - where could I get an appropriately sized bat head to work with?
Ideas or thoughts?
Started looking at the GT mold with a kitbasher's eye for the first time. I noticed this area just behind the shoulder marked with a red circle. If that could be sanded away, the arm could fold all the way back and the car sides could hang down instead of out to the back.
Basically, they would look like wings folded down, and could still flay up and outwards.
Has anyone tried to modify the arms on the GT like that? I'm not sure if it would affect the car mode. Even if it did, the unaltered arms still resemble wings folded down.
Painted purple, the mold could be complemented by a Ratbat persona, which is the other reason for my post - where could I get an appropriately sized bat head to work with?
Ideas or thoughts?