Lack of standardization will be a problem. Compare USS Fort Worth to USS Independence and USS Freedom. They are all different designs. This creates problems in interchangeability of parts and systems.
It's an interesting experiment, but that is all it is. An experiment.
A smaller, redesigned version of the old Soviet MI 12, but interesting none the less.
On a larger, more engineered version, you could bring the props close to one another by synchronizing their rotation so the blades don't hit one another.
About fucking time. We've had these huge smoothbore cannon for decades and nobody thought to revisit the canister rounds used in old cannon.
Now I wouldn't use it as much against massed infantry. Try birdshot for those pesky attack heilcopters. Tungsten shot would tear those composite rotors to...
I will say it will make a good frigate/corvette for the smaller navies that have displayed an interest in it.