As a fan of the old top-breaks, and a mechanical engineer, maybe I can help explain why there is still no .460 S&W Magnum, or any high pressure cartridge, in a top-break revolver.
Yes, you are right, it CANbe done.
A few things, though:
The gun will cost as much as an AutoMag, yet not outperform the current revolvers on the market - not to mention the T/C Contender.
It will be much more massive (bulky) than the simple and strong frames of these revolvers.
The key in mechanism design - keeping it solid and simple gives you strength and reliability. I just tried a box of Buffalo Bore +P+ loads in my .44 Ruger Super Blackhawk. AWESOME!!! THAT was fun. The solid simple design makes the Blackhawk the only one of the "big three" 44 revolvers (Ruger, S&W, Colt) to handle this load.
But, hey, I love to shoot those hammerless S&W 38's too.
Marty
Keep America safe - teach a friend to shoot.