It is mostly the Canoptek elements of the army that are big-like, with a feel sprinklings elsewhere. Many of the options are decent but are mostly in your Fast Attack and Heavy Support slots. So any bug-theme is ultimately side-lined by the Warriors or Immortals. You could go minimalist Troops and heavy in the other FOC sections but you lose Scoring units then. But metal bugs is a good theme; reminds me of The Replicators from SG-1. If I could have found suitable bug-like replacements for Warriors and Immortals, I would have done it.
"Fetch me another plaything. This one seems to have broken." -Urien Rakarth
Space Marine- "This planet is ours, witch."
Eldar- "No ... This planet is theirs ..."