About this 3D model

My dad Wavetek Back Support arm was broken, and I tried to contact Wavetek but they never answered to me :( So I decided to try to make my own ! This is my first attempt at 3d printing design, and I never used openscad before 3 hours ago. I tried to be to scale using a caliper as much as possible, but I don't have a printer yet (ordered one early this week, 4 week wait time :( Hope someone find this useful. I'll report back here when I get a print out and test it. The real design actually have hollow arm, but I'm waiting to see if it really needed with ABS. NOTE: I realize in it current form, it will be hard to print... but I'm sure I'll figure something out or one of you will ;)