Ah... yes, of course, a TOY snow plow would be fine -- as we see in that picture. I thought you meant clearing Donner Pass after last weekend's ten-foot blizzard.
In KSR, we get/give extra points for such extracurricular features powered off the drivetrain -- a giant propeller on top, a big rotary saw blade "slicing thru" a (paper mache) log, the head of the dragon turning from side to side etc. But it consumes a lot of precious muscle power.
Sounds like you will be moving back to Eugene, OR, eventually. Eugene is just down the road from Corvallis, which holds a fabulous two-day KSR every July.
I dreamed up that center steering/suspension arrangement during the long boring hours on the highway, then discovered that it was already in use on large machinery. Great minds think alike.
Triangulated three-link... You mean the third link is a triangle? I have that setup on the rear of my street rod. Yes, it could be done on a Kinetic Kontraption. Roller chains are actually somewhat tolerant of twisting, and much more so if you install guide disks on both sides of the sprockets. With a spring loaded tensioner, you could do it. But I'm not sure there's much need for it in KSR.
A lot of us use a center pivot for steering, because it eliminates the need for drive shaft U joints and also wheel alignment issues. When I converted "Henry" (avatar) from two-seat two-wheel-drive with spindle steering (lawn tractor)to four-seat four-wheel-drive with center pivot, I got rid of a ton of rolling resistance, specially when turning.