Peter
Wow, thank you for your explanations!
First, I want to say thanks for creating such a great tool. Many of us are running "shops" on tight budgets, so having a way to make multiple versions of the MFT bench is extremely handy. So good on you for your great design and execution.
As for the pins, I believe making these pins with a ridged grip on the sides of the pin heads would help, even when only pushing the pins partially down into the rulers or guide block. I live in an area that has a dry climate during the winter. As such, when I'm working in the shop I always tend to have dry hands, which makes them slick. So grabbing a smooth surface, like the pin heads, is quite difficult. I adapted and used a pair of pliers to help pull it up.
The "locator dogs" are a nice touch. I understand the cost increase. Honestly, the whole thing was worth the price.
So again, well done! Thanks for sharing this tool with us all!