you're probably better off using other sentinel weapons on a [Dethcube]

Mostly a personal [Dethcube] build, a melee primer for Condition Overload (as I don't typically run gas nor electric on melee weapons) and a decent hybrid damage/support weapon to help [Dethcube] generate energy and health orbs via the assist mods, what with gas and electric's AoE status effects.

You can randomize your arsenal loadout to equip [Dethcube] with [Deconstructor], which isn't normally possible otherwise.

Other random thoughts...

You can probably replace [Whirlwind], but in practice I love the travel speed on it for tagging enemies ahead of me.

I've considered [Healing Return] over [Primed Fury] to help with survivability, but honestly with [Synth Deconstruct]+Fiber, [Dethcube] is probably fine anyways (not like HR would make the biggest difference to it not dying by a stray grenade).

Yes, [Vaporize] works with melee mods, but it's not worth it (nor is it ever really worth the slot for that matter), especially considering the mods [Vaporize] doesn't benefit from anyways (+status, attack speed, [Condition Overload]...).