If you read through those who have reported problems, wings have come off in level flight in some instances. The thread on wing failure highlights concerns of construction. While some may have received good kits, other may not have and don't even realize this yet. Many had reported several defects with the kit right out of the box. Thanksfully GP recognized this and replaced items with very good service.
However, this doesn't help if the plane has crashed entirely.

This thread will hopefully gather the extent this is happening to pilots. Lets not jump to conclusions that this is just pilot error. While hopefully not, your's may be next.

As for oversized engines: The largest engine I recall is one person thinking of putting in was a SA twin 100T. A little much due to the final weight.
However, keep in mind many of the engines spoken of are very close to the same weight range (within 3 or so oz.) of a OS 61 FX with muffler assembly (if not less) or weighs less than the OS91FS. The four strokes that most are using are not going to do the high RPMs of the 2 strokes (unless your looking to bust your engine and your plane) and the typical prop that most have mentioned using are pitched at 7 or 8. This is well within the range of the 61 (if not slower) based on what one would expect in the way of speed.

The primary thing most will get from placing a larger engines typically spoken of is more thrust. Useful thing when going vertical or in a pinch.

I personally can see gaps in the spar on my kit viewed through the Servo Bay. I've gone to the LHS and looked at other kits and they were finetelling me this was not the way GP intented the kit to be built.

Hey now this is becoming another wing failure thread. Not

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MAX