Bill DiMartino created a new, upgraded Hull 9 part assembly that will make accessing your rear linkages and driveshafts much easier. In the original files, Hull9 is a fully enclosed piece that would make installation of linkages and drive couplings challenging (but not impossible). 

These new parts allow for a removable hull section that you can access that rear area with through the use of standard stainless steel bolts or similar hardware.