I know many of you have seen the superlative Tyracrons from Musings of a Metal Mind, a Necron counts-as Tyranid army. I'll blame this amazing example of the hobby as the germ for the idea, but after reading and watching batreps on how the Necron codex and its units work, I've lately been captured by an idea. I think it might be possible to build a "Tyranid" army using the Necron codex that would allow you to field Tyranid-like abilities consistent with the fluff and maybe more effective than the Tyranid codex. I should probably have another pint and chalk it up to wishful thinking, but I thought I'd put the ideas down here and see what you all think. Pretty sure the biggest challenges are in the vehicle/TLoS department/modeling for advantage. Note the unit comparison below aren't 1:1 analogues that translate directly across FOC slots, but are just general ability comparisons.
HQ
Tyrant/Tyranid Prime, Tyrant Guard - can be accommodated for with different Overlord/Destroyer Lord or C'Tan Shard combinations pretty easily (although C'Tan isn't HQ)
Tervigon HQ - no real analogue in the HQ slot
Elites
Lictors, Ymgarl - Flayed Ones and Canoptek Wraiths both fill these roles pretty well.
Pyrovore - these even suck in the Necron codex ;)
Venomthrope - no real analogue
Hive Guard - while an absolutely key elite slot in the Tyranid codex, the closest match here is probably the Necron Destroyer
Zoanthrope - not a clear match here for a key fluff Tyranid unit
Troops
Tyranid Warriors - Immortals, Lychguards, Deathmarks
Genestealers - Flayed Ones or Wraiths
Hormagaunts - Flayed Ones?
Termagaunts - Necron Warriors
Tervigon - Canoptek Spyder perhaps? Trying to parallel the troops and spawn functions ends up with a transport, probably the Ghost Ark
Rippers - One word: Scarabs
Fast Attack
Gargoyles - Canoptek Wraiths
Raveners - Canoptek Wraiths or Tomb Blades
Shrikes - Necron Destroyers, Tomb Blades, Triarch Praetorians
Harpy - Doom Scythe, maybe a Night Scythe?
Rippers - Scarabs
Heavy Support
Trygon/Mawloc - it's an absolute crime the Tomb Stalker didn't make it into the Codex; a Triarch Stalker is the next best bet; maybe Canoptek Sypder, from the deep strike/tunnel aspect, maybe a Monolith
Carnifex - maybe the Canoptek Spyder or Triarch Stalker
Biovore - no real analogue here
Tyrannofex - Doomsday Ark, Annihilation Barge, maybe a Monolith
This is my first attempt to get my thoughts down on paper - definitely haven't really researched the idea with any depth, or done any meaningful size comparisons, let alone thought it through to the point of trying to build an FOC-compliant Necron force using the matching models above. Without going down that road to really check, I think this might be do-able though. I think avoiding the big vehicles like Arks and Monoliths, and maybe even the Command Barges might be necessary to avoid TLoS issues. Just some musings on a Saturday afternoon...