hey the 1st quests research and build Manufactorm doesn't complete when you research and build it

It appears you can't "specialise" razorbacks and chimerae's even after researching according techs. I tested - these vehicles for imperium don't get anything from that tech, but if you play as SM or AM you can install different guns on them. I don't think it's intended, since the technologies are there for research and give nothing.

I don't recall there being any specializations for the razorback and chimera in the base game. There are some upgrades that give them weapons, but no actual specializations. So I assume you are playing with Heroes of Legends. If that is the case you could check your load order to see if Heroes of Legend is placed above the Imperium Mod and the submod for it. Alternatively you're using a different mod that hasn't had a compatibility patch made. Due to how Heroes of Legends is constantly being changed it could be that the patch for it is dysfunctional at this time.