Yes, top break guns are an inherently weaker design than swing out revolvers.
Yes, they no longer make new break open designs.
The first place I'd ever seen a below cylinder axis bore revolver was the anime Trigun.
The point you've had made to you twice now is that it would be cool to have a firing replica of a gun from a cartoon. Making such a gun is by its very nature impractical. However, such a gun would not be impossible. Several companies have made moving parts plastic replicas, one person even made a wooden one, there are even air-soft versions. The gun in the anime is clearly marked as .45 Colt which is well within a top-break's ability to handle. The only serious complications are the low bore itself, how do we transfer the blow from the hammer to the firing pin in an elegant and simple manner and how do we run the cam for the ejector? Engineering details not scientific questions.
Every once and a while you have to do something out of whimsy and not for cold functionality. A centerfire LeMat would be in this category as well.
I read what you were saying and understood it, you were explaining why top break revolvers were supplanted and replaced by swing-out designs. Do keep lecturing me on why top break designs went away while not reading what I am talking about. You may also consider teaching your grandmother to suck eggs since you are out to teach the taught.
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