Octorox said:

Here's a mock-up I made in photoshop. I thought it would be cool to see a stardestroyer in a planet's atmosphere. It makes no sense in the context of the movie though.

Actually, it would go some of the way to explaining how the imperial walkers got onto the planets surface in the first place (attack of the clones gave us the benefit of seeing drop ships putting the AT-ST's into battle). And with Vader waiting in the wings to land on the planet, i think it would work quite well. It also would add an increased scence of menace to the imperial attack on the rebels.

Thing is there would be quite a few number of shots where the stardestroyer would have to be included into, rather than just that one shot (including the speeder fly the legs bit - that could prove very difficult to do).

The workload involved vs. the benefits it serves, tips to far to one side, i would imagine.

It would look really good though.