I think it is the second post at the AA mods thread...

http://www.rcuniverse.com/forum/m_4886434/tm.htm

Remove the bottom wing and support the top with stir sticks..

The lego platform (wheels and flat based) worked well for turning the bipe into an RC car. Building up legos on the sides of the plane kept it from falling off and pretty steerable with enough space. Not enough power to launch though.