It looks a bit like an MSU style list of old. I am not sure your staying power is good enough for objective holding in the current edition.
Especially the Exocrines might be dead pretty quickly, because they are the only "tanks" in the list and cannot hide well.
For Vanguard detachment I would recommend 1-2 Flyrants and maybe monsters from Deepstrike eg out of a tyrannocyte.
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