I have watched a "making of" video about this knife (or rather the original Martin version). It is out there somewhere, either on the Martin website or YouTube. It is very interesting, and I have no qualms about the strength of this design.I have searched online to try and find photos or an otherwise good description of how exactly the Martin blade to handle installation is done.
So far I have gathered that the blade stub tang is threaded, and that so too is the tube handle, and the blade and handle are screwed onto each other.
I would love to find a picture that shows the blade, guard, and handle, all prior to their final assembly. I haven't been able to find such a thing.
eta: Not the video but....