Did this plane precede Wayne Ulery's EU-1A, or follow it? PAC lists the EU-1A's wing area as 965 sq." which is the same as what you posted for the Mama Mia, and their wing planforms are somewhat similar. Interesting.

In comparison, the UFO has a root chord of 13" and an 18% section. I assume the Mama Mia's airfoil high point is pretty far back, like around 40% of the chord? Looking at the Brushfire plans - another biggy - it has a root chord of around 17" and an area of 858 sq." and a 16% airfoil, so it's a little smaller.

Are you really going to build one? I think you definitely should!