Bluefilosoff, the vertical pieces on my pedestals, are full thickness boards (1.75"), but they are formed from two boards edge glued. The glue line coincides with the center line of the mortices, hence I could rough cut the mortises on the table saw. I'm using Douglas fir boards from trees that we had to take down when we built our house 10 years ago. At the time, I had them sawed up into 8/4 boards, so I was able to get a milled thickness of 1.75".
The table is going to have a 30" middle extension, so I will be attaching a set of table extenders (type B below) on top of the pedestal assemblies.
Lastly, I plan to attach the stretchers using a horizontal wedge. When I was designing the table, I did give thought to attaching them to the inside of the pedestals using bed rail hardware like these.
In that case, I would have attached a dummy tenon and wedge on the outside of the pedestal to get the traditional look. In the end, I opted for the real meal deal -- i.e. a through mortise and tenon connection.
I hope you'll keep posting on the progress of your project. I'll follow it with interest. I'm taking lots of photos and plan to post a "start to finish" thread once I'm done. I work slowly, so it may be a while, especially with fishing season happening soon.