I DIY'd a set of rail seats for our First 285 out of teak. On the 34, you'll need quite a large notch for the backstay on both sides. I find that with such a large cockpit, and with seating which already extends all the way out to the rails (granted, there is a 'curb'), that I don't need or want stern rail seats on our 34. If we are just drifting along on a warm summer day, then I lounge up against the railing in the corner. If anything, I'd like a little cushioning on the rails.