There is no specific M715 kit, however, DToys out of Korea makes the Korean copy, the K311A1. I haven't seen it myself, but have heard it is very nice. I have some of their accessory and conversion kits and they are really nice and perfectly cast.
Here are a couple in-progress build ups of it I found.
Dtoys are available through Lucky Model.
Gino P. Quintiliani - Field Artillery - The KING of BATTLE!!!
Check out my Gallery: https://app.photobucket.com/u/HeavyArty
"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf." -- George Orwell