If possible I'd alter the dialogue so Vader says,"Your mother once thought as you do" but even without it the waterfall (and maybe with a snippet of a delicate version of Across The Stars) would be enough to get the idea across.
I don't have a problem with Vader's shuttle but I do think that Tydirium should be a transporter because it's cover is transporting parts and supplies and a bigger ship would allow for more Rebel troops and materiel in the ground battle.
I had a little go with a smaller waterfall :
