Wrote a long reply as to why the hormagant is a much better choice than the termagaunt, and then you have gone and used H's not T's anyway
Maybe just upgrade one unit?
Three squads of 25 naked, and a squad of 25 upgraded is only 10pts more, and gets 20 more bodies. (a bit more money though)
Unless its been FAQd, none of the nid HQs (or any nid) is an IC, so they cant join squads, except Tyrants and Tyrant Guard.
The Doom is utterly sick, and provides such a distraction you MUST take it.
Unless you battleforce it
Three battleforces gets you 9 warriors, 9 ripper swarms, 24 Genestealers (20 in a pod?) and 48 of each gaunt, 28 on the field and 20 in a pod?
Not an ideal list by any means, but its a lot of options right from the start.