>superior design to the SMLE?
Yes
>good platform today to the chamber in different calibers
Remington used the design and tooling to make the Model 30 after the war, and a lot of 1917s got sporterized after being surplussed.
But today? If someone were making them new, sure. Except they're not. So go out and buy a barreled action from Howa or whoever-the-fuck instead of chopping up and irreplaceable hundred year old rifle.
>is there something inherently bad about the design?
The bolt stop / ejector contains an integral flat spring that tends to break easily. It's the rifle's one real flaw.