well, not sure if it will work or not yet, but i'm nearly finished with my tandem WIG
weight should be around 4-5 oz (113 grams to 141 grams) rtf.
5 gram motor, 300mah 2s lipo, 1 4 gram servo and a gws pico rx.
mostly 6mm depron, with some 2 and 3mm mixed in. the front wing is a single piece of 6mm with camber formed into it, the rear wing is 6mm plate with 3 ribs and a top skin of 2mm. i tried to get the front wing to have a little more aoa than the rear one, so we'll see what happens.
run time should be around 6-8 minutes at full throttle
so maybe longer if it doesnt need all that power.
will take some pics and post them in a few minutes.