Indeed, one can see the rather significant difference in recoil spring placement relative to the hand.
It's the next logical step versus adjusting bore axis alone such as in the arsenal strike one or steyr m9
Me thinks it would be significantly harder to make the frame for this type of design out of plastic with inserts (ala glock or MP) due to the durability, strength and dimensional accuracy/precision needed.
No problem for Hudson though has having a steel frame fits into the whole partial 1911 lineage thing they are utilizing to other benefit as well as for marketing.