Matt,

Thanks for the tips.

After trimming and sanding my panels weigh 41.6, 41.8, 35.6(!), and 41.1 grams, so the stuff supplied by Mark Hunt with the "pro" kit is definitely worthy of the project.

I know there are several different theories about gluing the sheeting together (or not gluing at all), but I decided to follow the suggestion of Clay at The Balsa Store and glue them with plain ol' Elmers White glue. Worked GREAT! Easy to apply using one of those little plastic applicators (that looks like a pipette with a squeeze bulb on the end), easy to wipe off excess with a paper towel and easy to sand. The panels all came out flat with zero buckling even before sanding.

In any event, weather is superb again (like yesterday, ugh!) and family obligations are met, so I am going to fly the hard-mounted SAP today for the first time.