A clear replacement body sits over the chassis, and the body posts are easy to see through it. After painting, that useful view disappears. Planning the mounting holes before the colour goes on can prevent an avoidable alignment problem.
Confirm that the shell belongs on the chassis
Check the body manufacturer’s compatibility and fitting instructions. For example, Pro-Line’s body preparation guide discusses marking mounting holes before paint. Wheelbase alone may not settle fit: wheel-arch shape, width, post positions and clearance can also matter. Place the unpainted shell over the chassis in the intended orientation and compare the wheel openings on both sides.
Keep the shell level and supported while checking its position. A body that has slipped sideways can produce neatly marked holes in the wrong places. Recheck front, rear and side alignment before making any permanent cut.
Mark, then verify
Use the marking method recommended for the shell and its protective film. Identify the centre of each required mounting point and check the marks with the body removed and replaced. If the body uses a clipless mounting system, follow that system’s fitting process instead of assuming conventional post holes are needed.
Use suitable tools and eye protection for the material, and follow the manufacturer’s cutting or reaming guidance. Keep hands away from the cutting path. Enlarge holes gradually where the instructions permit; a hole made too large cannot simply be put back.
Check movement before painting
Test the body with its intended mounts and check clearance according to the vehicle instructions, including steering and suspension movement. Remove it again for the specified cleaning, masking and painting process. Keep paint away from components that should not be coated.
Photograph the successful dry fit and label any small mounting parts. The aim is to finish the uncertain fitting work while the shell still provides a clear view. Paint is a satisfying final transformation, but it should not be the stage at which you first discover where the body needs to sit.