I semi agree with this list. The presence of genestealers and lictors fits the fluff excellently, however, much of the rest seems off to me. I seriously doubt you'd see Biovores early on, as they are slow and vulnerable, and the early stages of a Tyranid assault are focussed very much on speed and decisiveness. Similar arguments apply for zoanthropes. You're missing one hugely important unit regarding early attacks: gargoyles. Gargoyles make a big part of the early attacks of a Tyranid hive fleet. I also think Gaunts would not make a particularly strong appearance, certainly not in a brood that large and unwieldy. I think troops should be purely genestealers, or genestealers and hormagaunts combined. Heavy Support would not make an appearance in a scout force, for damn sure.