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Here's a competitive list that maximises the ordnance firepower of the ordnance tyrant! Should be good against anything that isn't flyng, invisible or high AV

Purge Detachment with Ordnance Tyrant
• Command squad with ordnance tyrant 75pts
• 2 x Wyvern 110pts
• 2 x Wyvern 110pts
• Earthshaker carriage 55pts
• Earthshaker carriage 55pts
• 2 Quad launchers 60pts
• 2 Quad launchers 60pts
• 2 Quad launchers 60pts
• 3 Rapier laser destroyers with 3 additional crew + militia training 79pts
• 3 Rapier laser destroyers with 3 additional crew + militia training 79pts
• 3 Rapier laser destroyers with 3 additional crew + militia training 79pts

CAD
• Command squad with nurgle covenant + autocannon 65pts
• 30 plague zombies 90pts
• 30 plague zombies 90pts
• Infantry platoon
20 with 2 autocannons, sigil + vox, militia training + champ 105pts
20 with 2 autocannons, sigil + vox, militia training 100pts
20 with 2 autocannons, sigil + vox, militia training 100pts
• Hydra (militia training) 70pts
• Hydra (militia training) 70pts

That's a lot of things!

It looks pretty balanced, though you may struggle at maelstrom objectives due to your limited mobility.

One list building thing: I believe your warlord needs to have covenant of Nurgle in order to take the Plague Zombies, so you can move the Covenant from the CAD guy to the Ordnance Tyrant.

Ah thanks for the advice. I've made a few slight revisions - upped the number of infantry + added some spawns at the expense of some artillery. I think that realistically they're only going to have so many targets before most infantry are wiped out haha. What do you think? Better or worse?

Purge Detachment with Ordnance Tyrant
• Command squad with ordnance tyrant + nurgle covenant 85pts
• Wyvern 55pts
• Wyvern 55pts
• Wyvern 55pts
• Earthshaker 55pts
• 3 spawn 55pts
• 3 spawn 55pts
• Quad mortar 30pts
• Quad mortar 30pts
• Quad mortar 30pts
• 3 Rapier laser destroyers with 3 extra crew 79pts
• 3 Rapier laser destroyers with 3 extra crew 79pts
• 3 Rapier laser destroyers with 3 extra crew 79pts
• 3 Rapier laser destroyers with 3 extra crew 79pts
CAD
• Command squad with autocannon 55pts
• 40 zombies 120pts
• 40 zombies 120pts
• Infantry platoon
----------20 men with lasguns, vox, sigil and krak grenades 80pts
---------20 men with lasguns, vox, sigil and krak grenades 80pts
---------20 men with lasguns, vox, sigil and krak grenades 80pts
• Hydra with training 70pts
• Hydra with training 70pts

As a second thought, can I even take spawn? Despite reading the rules repeatedly I am not sure how they are unlocked...