The patient below was treated with an SBRT technique to 5000cGy in 5 fractions following RTOG 0813. I used a 9 field beam arrangement with some non-coplanar beams and prescribed the plan to 80% to get the PTV (shown in cyan) covered by the prescription and the GTV (shown in red) covered by ~110% of the rx as per the physician intent.
Below is an axial view with the uploaded constraints to the OARs and target volumes, which are all met