Not to throw fuel on the fire but don't assume that they were done internally. The C-ARF work towards the end of their time was sub par. I broke a set of booms in flight on one of the last kits that came from C-ARF. These had the external plates, and one of them was found at the point that I did a hard pullup for a square loop. The airplane should have a BVM serial number in it and your best bet would be to call BVM. FWIW my hard pullup was at close to full throttle. I flew mine hard and a lot, the first two were built by me and painted with the second one having some additional reinforecements to the booms. The latest generation of KC's you could likely chop down a tree with the booms.