There are some here who seem think the composite planes, (Comp ARF, Airworld, SisT) just fall out of the box & fly. These threads may give you a little more insight into just what is involved in the building of these models:
http://www.rcuniverse.com/forum/m_6531187/tm.htm
http://www.rcuniverse.com/forum/m_2009965/tm.htm