>>5468636A Chimera, like any chasis, can have whatever we want on it. There's various canon variants based on the Chimra Chasis, from the Hellhound (flamer), the Banewolf (acid launcher), the Devil Dog (multi-melta).
But we can think bigger than that. For example, the Great Crusade had volkite leman russ variants.
Add to that we can gut out a lot of the internal living compartment in favor of mechanical replacements such as autoloaders, automated pilot, etc. and we have even more space for say, armor or weapons components.