I watched the clip and I was completely blown away by how much work went in to this. Improving the stop-motion on the AT-ATs was incredible, and a lot of the things we take for granted in modern movies being added was just fantastic.
I did feel there was one place that went a little too far, which was the snowspeeder count. In the clip we see, at least, there's a very clear count of four speeders (save for the "Echo Station Fox Seven" shot), and it further emphasizes the impressiveness of the fight by showing how under-equipped and inventive the Rebellion is. With the additional speeders, whom we do not see during that fight, some of that impressiveness is lost for the sake of one shot. If there are more speeders for the sake of continuity that I'm unaware of, I'm not sure it would really be that many.
In terms of the AT-STs... I'm honestly not sure why they're there in that reveal shot. Maybe I'm missing something. I'm not the biggest Star Wars guy around. But in these clips the AT-STs aren't serving any purpose in the battle. But more importantly, they're taking away some of the impact of the AT-AT shot. Basically, the Rebel base is a small, carved ice cave, nice as it might be.There's an important focus on the cramped feeling in the framing during the Base scenes. They're a blip in the ice, barely scraping by. Even the initial confrontation was with a wampa, a large beast: But off-screen, and even then not much bigger than Luke.
And then we see the AT-ATs. These huge, behemoth things that dwarf the snowspeeders on a scale of at least ten to one. If they chose, just one of them could crush the Rebel base by walking over it.
And there's five of them.
By having the smaller AT-STs in the frame of that particular shot, you lose some of that "Oh God" impact by having your eye drawn to these smaller mechs, and the scale is lost.
I dunno. Maybe it's just me. It makes, as far as I can tell, two cameos in the Battle of Hoth. In both cases they feel like something that could be removed altogether without losing anything related to the story or atmosphere.
While saying that, I want to strongly impress that I love the work you've done here, and that I will be a day-one watcher of ESB:R and ROTJ:R. Your talent and skill is stunning and we are all lucky to have you working on this project.