Looks alright, and more options are always good.
But,
It would make your gun EXTREMELY front heavy, moreso than a PEQ2 because the cells are farther forward.
In addition, Airsoft throw levers blow! I've played with King Arms and STAR levers (ARMS-type) and they were loose.
If this thing is built like the real M900, and can accept the LaRue levers, that would be my pick.
My solution for front heavy ANPEQ2A battery packs? Storage stocks.