betterbuilt
I build stuff from milled slabs
I suppose how much effort is put into attaching a flat surface to the log depends on the length of the log... I use a concrete form which is plenty long for me since I mill short longs {60"} for bench seats. To attach the form, I use 2 x 3" long deck screws on each end. When it's necessary to use a wooden wedge to hold the form more stable, I run the screw through the wedge.
Photo here.
Your link isn't working for me.
www.arboristsite.com/milling-saw-mills/188738.htm#post3356339
I think this is it.
Nice work!!!!