Dorvack is way cleaner and more cartoony than Ma.k
Dust is more like WWII panzer with legs, cool but not ma.k
Other Yokoyama things come close, like Blechmann and Robot Battle V
Anything Makoto Kobayashi is close too, they made similar models (even together).
And Junk Tank Rock comes close too.
But most stuff that really looks alike is just resin and expensive.
Robot battle V is coming with 1 plastic kit next year, but the rest either resin or scratchbuilding.
Which is what I would recommend, scratchbuild/kitbash based on those designs.
I can send you a link with many pictures of similar, organic robot stuff, pm me if you're interested ^_^