I have run a couple different comps with Tower now. For you, looks more than doable with your champs. Maneater, Tower, Fayne, Farakhin and Septimus.

Here's a video on the basic setup from Hellhades: https://youtu.be/RH-OBce9ZRg

Here's the Speed Tunes for the UltraNightmare comp, you'll want to put Fayne into Draco's spot and Farahkin into Kreela's spot: https://deadwoodjedi.info/cb/9d9c3d32755672fc95ca8580c0dd0a27f651c2c5

I would work on this team over budget unkillable any day. Seems like it can really slam, especially with Farahkin going 4:3.

Thanks this is a huge help. 

Other than speeds are there any hard stat requirements that have to be around similar numbers to make it work like you do with the health and defense stats on budget unkillable?

Here's who I'm currently using in a Tower Block damage setup:

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And here's my builds since you were asking about specific numbers. The speeds are gonna be different, as I'm using Seeker, so follow the ones recommended in the video and the website! I know there is quite a bit of room for improvement in my gearing, this is still a work in progress! :)

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This was a huge help. Finally managed to finish gearing all the champs and maxing masteries. Can now hit for around 45M which is a 2 key UNM. I will eventually post the build (if I remember too) of each champ I used and an image of the total damage. Thanks again.

Please do post! I'd like to see. :D

And you're very welcome!

Here is the damage Fluctuates between 42-45M. I will post each character build slowly as I get time. If anyone has advice or questions feel free to post. I give credit to harleQuinn for helping me out with team setup and posting her setup as it was extremely helpful. As well as Hellhades  website and This Hellhades Youtube video.

Edit: Everything is posted, I hope this can help someone in the future as this was a huge boost in damage going from just barely making a 4 key UNM with a counter attack team to an easy 2 key UNM.

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First is Maneater. I got lucky and managed to get both books go to his A3 only.

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Second is Roshcard. Got lucky with books only going to his A2 and A3. Booking his A1 is unneeded but it would give more damage output. I may revisit his build later when possible, i didn't max crit since he will be in a party with Farhakin but I use him for other content so may adjust that later. Went a mix of atk and HP since his A1 scales with attak and A2 scales with HP.

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Third is Fahrakin the Fat. He is fully booked. Please note his A3 crit % and crit dmg buff does NOT apply to himself so you will want to max his crit %.

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Fourth is Fayne. Lucky books again and all books went into maxing A2 and A3, no books in A1. Pretty straight forward build for an attacker with debuffs. May rework her a bit at some point. She isn't used anywhere else except FW and she probably doesn't need that much defense but originally built her for budget unkillable then pulled Roshcard a week after pulling Maneater so went with this instead.

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Last and probably one of my favorite champions Septimus. Again, pretty straight forward attacker, accuracy only needed for debuff extension.

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Posted all the champions setups and the total damage. I will eventually upgrade their gear to get more damage output, but I'm happy to go from a barely 4 key to an easy 2 key UNM haha. Again thanksa ton for the advice.