This is maybe the fourth time since I joined ASC that I've seen Echigoya even mentioned. Where are you seeing all these posts about it?
I know that they do make custom reinforced mechboxes and other such parts under their own brand name, even got to see them producing them as one-offs. Hadn't heard that they were importing guns here to Canada though. I know their old defunct website ran by a guy by the name of Shane from Hawaii is now long gone and their current English page is sometimes-on-sometimes-off.