Kraton Larger battery tray?

[Friso Fox]

At the end of the battery tray towards the rear there are two or three holes in the chassis (forgot to take a picture).
Does anybody know what these are for, perhaps to install a bigger/longer battery tray?

 

[Magnus_CA]

At the end of the battery tray towards the rear there are two or three holes in the chassis (forgot to take a picture).
Does anybody know what these are for, perhaps to install a bigger/longer battery tray?

Not sure about the holes but Vas from Aussie RC Playground severed the vertical collapsible guides on the battery tray so he could fit in a 6s Graphene battery. He makes short mention of it in one of the many videos he did on the Outcast and shows an after shot.

 

[Friso Fox]

And I remember a video from Mydoddy69 RC unboxing the Outcast, he mentions the two holes and says Arrma probably already has an extended battery tray in production wich they should have installed in the first place. That sounds logic I guess.