Here you can download free plans for a foam rc plane.
First flight of 3D printed plane
3D printed airplane - Assembly guide Model Y
Flying carton - homemade RC plane
VIPERJET MK2 RC airplane build video by Ramy RC
PC Fan Powered Airplane!
DIY How to make a Rc plane at home
How to make rc plane at home
How To Make a Airplane RC
Online calc of the CG of an RC airplane