RE: 1/2a House of Balsa Bonanza V35
The HS65's are wonderful servos. Just slightly larger than the 55's but stronger and faster. You could easily lighten it enough to have flaps and retracts, room for all that equipment is there but it may be tight.
I used to fly a V35 and loved seeing the model in the air. Its outlines aren't terribly accurate (for example the nose is way too long) but for some reason it looks like a perfect little reproduction.
Keep us posted.
Ben