Homosote works best holds the pins well yet easy to remove. Any glue drops pick them off and the homosote comes off below the surface so your building area remains true. You can even touch things up with a sanding bar as the homosote is the same the whole thickness. I use solid core doors for the base over 25 years same one no warps. These were skid doors which were the doors at the top of the skid and were marked from the steel shipping bands. 15 bucks each. In fact all my benches are topped with these. Vices and sanders etc bolt right through giving a tough solid work surface.
PS as far as the Lazy Ace goes you can build it in a multitude of configurations and power systems and it all seems to work wonderfully. A timeless design.
Dennis