my father had something similar years ago for edging or splinting but it was set up with a track and a light table that the boards set on, if i remember right it had peg holes for each inch so to keep boards square. I know it would take a 8 ft 6x6 and cut it into boards, that is the only thing i ever see it used for, almost like a bolter but longer table.
For cutting off we had wooden framed swing saws, and almost think that would be better, but i know the safety police will say that is a no no but a lot of guys used them there whole life and never got hurt on them! I thought about setting up a swing saw using a big miter saw blade which would give you 5 inch deep cut.
There was also a big cast iron table saw, 4ft by 8ft with a 18inch blade or so that was used to split boards into clapboards, no i never remember any guards or hold downs but am sure that could have used some, that table saw had i think 5 hp tecumseh engine on it, but was geared up or down with flat belts.
I think you need to be thinking about blade speeds now.