Wayne - I'm not criticising anyone - who am I to know why something was done all those years ago!
The triangular block at the bottom is a bit of pine spot-glued on for clamping. I'll split it off when the ribs are clamped up.
Ken, If John Lott the luthier had a son called John, then there would be TWO John Lott Seniors in the mix! There sure are a Lott of them