You will make this like the Eidolon Gantulyst. Exactly. In every way, health pool, armor, shield stats. All of it. Including for the requirement of enemies to grind up their time to get the best in slot Amp, in order to actually damage this warframe before it kills them.
Abilities from Eidolon for our new warframe:
1. Ground Smash. If you've seen it, its probably taken you out of the fight.
2. Super God Ray. Because its cool, and this would be a good DPS ability.
3. Summoning Scream. Because this kind of ability is going to be clutch. Who doesn't need a massive swarm of vomvalysts to come and help?
4. Gantulyst Shield. Defensive and survival ability. If its deemed too over powered, sub in Regenerating Scream, but allow it to affect the warframe less, and more for the rest of the part & summoned vomvalyst drones would be some sweet synergy.