The hiveships are made out of Carnifexes (yet another thing you can use the awesome Carnifex kit for
) and bits of dinosaurs for one of the tails.
The rest is pretty straightforward:
Hormagaunts for escort drones
Devourers and Deathspitters(?) for the Vanguards. I used copper wire for the tentacles. Not my idea, it's been done before but I don't have the link handy. They are also heavily inspired from this guy's work:
http://trolls-feuillus.forumactif.com/t ... e-tyranide
Tyranid warriors for the Krakens, not the cheapest option but I like the looks and I had quite a few lying around. I also have some with massive claws that are inspired from the kraken that appears in the Warp Rift 16 netzine.
Ordnance are just toxin sacs and adrenal glands mounted on needles and copper wire.
Glad you like them