Great pics.
Just looking at the suspension from a different aspect, thinking of rider safety,
would it be possible for the riders clothing ( or worse?) to get caught in the swing-arms in some situations?
Like a lot of other comments, the rear of the sled looks unfinished, or something missing.
Dunno. ???
Another observation, even on a trail sled sometimes you want to step back on the running boards for weight transfer, like crossing a road , I like to unload some weight from the skis so the carbides don't dig in quite so much, I'll step back on the running boards.
Same thing for some ditch bangin' situations.
Nothing there to step back to, on this setup.
Again hard to tell w/o actually riding the machine.
Oh, one last observation, about 4 years ago at the Minneapolis convention center "snow show" my son who is a mechanical engineer and myself were talking to design engineers at the Redline booth.
Yup, they had a prototype Redline sled on display, with a automated mechanical system that would move the suspension thru its travel.
Not wanting to start an argument here, but going from old memory, it seems there are similarities.
I'm not saying they are the same, or copied, just "similar".
After all, most suspensions on current production sleds are "similar."