Thanos wants to be a ruler of his own kingdom he puts as much effort building the empire has he did trying to wipe out the universe of life. With 5 years of prep to build his empire how powerful would it be and who would it take to bring it down with or without prep?
Kingdom has an army of 125,000 warriors created by Thanos. The army are housed between the gaurds housing through out the Kingdom
Vast defense and offensive weapons
15,000 guards That Thanos made half the guards live and protect around the perimeter of the kingdom. Half the guards live close to Thanos' palace
The heroes show up and fight. Thanos flops and fails. Adam Magus shows up to mock Thanos' self-inflicted fail. Marvel makes a bunch of money. Somewhere in some treehouse, Quanchi cums all over himself and dies.
If they are Thanosi then he murders the galaxy, but gets attacked by his children. Since the real Thanos can't die he constantly rises and kills his usurpers.
Just because he trying to rule a kingdom doesn't mean he is bad. He has a combined army of 140,000 plus with his smarts I am sure he would have some powerful defenses and weapons. I would also thinking since he made the guards they would be rather formidable.