Yeah,
Lanier used a lot of Vac plastic and those mid 90's kits were built like tanks. Are the wings/tail foam core??
http://www.happyhobby.com/hobb_html/...extra_300s.htm

There's a thread in the GS Aerobatic/3D forum,,, a 1/3 Lanier Laser 200, they were designed the same way, that guy is repalcaing the plastic turtle dek with a built up structure
http://www.rcuniverse.com/forum/m_9957957/tm.htm

good luck