Glad you liked it. Yes, I did draw a holder for a cutoff blade, but haven't had time to make it yet. It borrows from a design I did make for my Unimat. I've written up the whole project and submitted it to Neil for consideration. He seemed to like it. He asked for the pictures and drawings in their prefered format so I guess that's a sign that they will publish it. But I don't know where it might fit in his publication schedule. It does include the drawing for the cut off holder.
I will contact you off board on this.
As for the boring bar holder, I haven't done one because I already made a very simple one that's even more solid than the post. I will do one sooner or later, perhaps after the cut off. However, it should be very simple to design. The only thing I'm thinking about is that the boring bar should be at a similar angle to the square tools in order to minimize the need for rotating the post itself while working.
Make it fit.
You can't win and there is a penalty for trying!