I am in the process of building a 1/5 scale Pica Cessna 182. I have mostly finished building up the fuselage, but there is one major part that has got me stumped. I could use some help identifying where this goes. It looks like it should go somewhere near the landing gear, but the plans show the whole bottom being sheet and block balsa. The ABS part is 7"x3" by about 1" thick. Thanks in advance. Ron