That must have been a long time ago because for the past 15 years or so, Classic Wood (when Steve owned it) had to make them in 3 pieces to be able to affordably ship them. I knew Steve well and we had this very discussion about why he did them in 3 pieces. Any chance your wood came from Meyers in Wichita?
In this application, because the Lift-a-Dot fasteners are almost like a small lag screw, it will work fine within the Kwik-Poly bedding however Kwik-Poly sets up hard and does not work well for retaining nails, tacks, & brads because it does not give to be elastic around the fastener. Kwik-Poly was originally invented for the Equine industry where the Ferrier could mix up something quick to apply and reshape for correcting horses hoofs. When they nailed into it, they often bradded the nail over to keep the nail in the hoof.