The Destroyer Cults think nothing of sacrificing their physical forms to optimise themselves for slaughter. Whether you're looking to scythe through infantry or crack your enemy's biggest tanks with ease, you'll want a Lokhust Heavy Destroyer.
A nice basic kit, which is pretty straightforward to assemble.
I’d probably advise leaving the main armour panels off, to make it easier to paint though.
In addition, if you want maximum flexibility it’s easy to use magnets to secure the guns so you can swap them as you feel the need