Wow that looks really good. I would love to see the grindmaster do a diff tempered Swamprat like an M6 and really bring the hamon out.
I have a Cheness katana that I had a custom handle(tsuka),wrap(tsukimaki) and guard
(tsuba) made for and now I plan to do a really nice hybrid polish and saya.
My Cheness is through hardened so it does not have a real hamon but the only tougher sword is probably the AK47.

If the grindmaster wants to do a really ambitious project I have always wanted to make a Ruck into a traditional looking wakizashi. You would have to grind of the hand guards and a chunk of handle, remove the crinklecoat and hand polish the blade as well as make a handle and saya then wrap the handle in rayskin and silk.
You would also have to make a tsuba fit. It would be a lot of work but you would have a traditional wak made of INFI!

Imagine being able to go Andy Wayne on a car or chop concrete?