I also bolted the cabin frames to the undercarriage today. I had to remove these (4) AN470 rivets from both sides in order to get the brace in place. I find that the AN470 are very easy to drill out. The bolts were 1 size too long in the areas indicated in the manual. They call for AN3-7A and AN3-6A, however the correct bolts should be AN3-6A and AN3-5A instead. A washer is used between the nut and the frame. This provides the acceptable 3 threads showing from the bottom of the nut.
