Hello Brian, The miniplane is covered in profilm[ a tough plastic film ] you may know of it. Ican honestly say it is built as plan with correct number of standard servos with the exception of u/c which is light duraluminiam [but strong~ never bends] I did have the original wire undercarriage but got fed up with bending back after every landing! My model seems heavier than most but is very stable in flight. Low slow fly past at half throttle rock steady into a lovely high powered loop and roll off top without any fear that it will fall out the sky. The OSFsa 81 is final of several fourstrokes used over a period of 6 years and in my 66 years of flying~started at 14 years old~ the best. regards Glen.</p>