Ah, finally one of the three where my interest goes most (together with the A-wing and Millenium Falcon). And I have to say, you didn't disappoint me with this Y-wing Docter.
The proportions seem about right, from the shape of the ''head'' till to the size of the engines (although it might give it a robust look, some folks make them way too large ). I believe that most people think that the engines of the Y-wing are pretty big, while they are not that large compared to the body of the ship. Kudos for that. Those engine domes work fine for me, they are no eye-catcher in any negative way. My only concern goes to the pins located at the tubes in the back; they might be the right size, but due to all the edges on them, they are somewhat too notable in my opinion. At the other hand, it's not that big of a deal, and it doesn't look bad or so...
The well-greebled body is great, but the ''head'' is even better. It has the right shape, not too curved, as most people seem to think it's so, but almost straight, with only a very slight bow.
Except from the engines there is nothing to complain about. I understand it had to be hard to design the engines, I have tried myself a while back when I was working on a midi-scale Y-wing, and due to the fact that I couldn't find a solution for the engine domes, I gave up. You didn't, (couldn't actually) and I'm really glad you made this excellent Y-wing in such a tough scale. I haven't seen any other Y-wings in this scale yet (bring it on with your links fallenangel ), so I would love to see this one in real.
And that's my question too actually, are you going to make your LDD creations, or some of them, in real?