As Seth says, those "woodscrew" mount holes can be a problem. They are typically sealed in the OEM subframe, but only to provide thread material for the screws. Since it wasn't designed to hold fuel, there's no tech requirement for those many (needed) mount holes to be fluid-tight and so threads may punch through etc. Hit or miss especially after bouncing around on the trail. Not saying it can't be done, but as the Husaberg racing team found, it was unreliable. Hope it works out for you.