Here's a _very_ preliminary background for the Technids (anyone can think of a better name btw, or keep this one?) and a suggestion for a weapon type.
I have another question for the Tyranidologists here  Are there still purestrain tyranids produced every fourth human-genestealer-hybrid generation as I read somewhere?
Also, my idea was that the purestrain tyranids become the organic part of the ship, while the hybrids run it. Is this at all possible?
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Technid Fleet
Most Technid ships originated as Imperial or Chaos Vessels which were unwittingly infected by spores after a Tyranid attack and were, sometimes years later, taken over by the resulting small Tyranid Genestealer force. Having very low amounts of biomass at their disposal and finding themselves out of reach of the Hive Mind, to survive these Tyranids evolved a way to link themselves to the captured ships and their systems and use them as a readymade ?shell?, eliminating the initial need for biomass in terms of armor and weaponry. They found ways to make use of existing weaponry, evolving replacement ammunition. In older Technid ships, some parts of the original ship have been replaced by organic matter. Day to day affairs on these Technid ships are run by Genestealer hybrids, the descendants of the original crew.
Sometimes a void creature cut off from a Hivefleet comes across a Technid fleet. The Technids, no longer under control of the Hive Mind, have trained the descendants of Imperial Navigators to act as a substitute, allowing them to bind these creatures to the fleet. The control is shaky at best, so most Technid fleets have only a limited number of void creatures in them.
Biomass batteries
Biomass batteries fire specially evolved spores which, while inflicting significant damage, also burst apart in a hail of infiltration organisms which are attracted to high energy systems. When a ship suffers a critical hit as a result of Biomass batteries, enough organisms have survived the initial impact and have rallied around a key ship component. They collectively project a signal back to the Technid fleet, guiding fire to this sensitive ship component. These organisms, though resilient, are only evolved for this one function and are easily dispatched by the enemy crew once located if they are not killed in the Technids own fire.
Biomass batteries function like regular batteries with the following distinction: when a critical hit is scored, for the remainder of the turn Technid hits on the stricken ship need one less on their roll for critical hits (usually scoring a critical hit on a 5+ instead of a 6+).
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edit: added a few more inspirational mockups of Technid escorts:
 
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