They did more than that:
Dual xeon and 3x1080..
but i wouldn't consider them near SFF.
But it seems that Calysos is working with Supermicro and LinusTechTips is going to have a video on it.
The options for fanless SFF (sort of) have been very limited but seems to be improving.
Supermicro launched one:
http://www.tweaktown.com/news/55763/supermicros-silent-fanless-pc-rocks-gtx-1060-kaby-lake/index.html
Calysos have one on the way...
That photo isn't mine, but i think the guy posted some measurements in his thread. I'll see if i can find it..
EDIT: http://www.overclock.net/t/1563907/build-log-unit-3-1-tri-sli-matx/10#post_24165622
Don't think it's even possible to do a bridge, you'll have to go with http://www.watercoolinguk.co.uk/p/Alphacool-SLI-connection-1-Slot-Black_33420.html
Unless you try to go over and under, but that seems overkill..