You could do the render in V-Ray and then manually add the line work on top in photoshop using a “line work only output” from sketchup to overlay. I know in Thea render you can have section cuts exposing the interior like this illustration and the render still works in terms of lighting as if the walls were all still in place @eric-s might be able to enlighten you more in how that works in v-ray. But i looks like this could be lit as if the top is off the building? An AO render might work with the addition of the linework in post. Enscape might be good too.
see this recent discussion: Rendering in Vray with lines - #8 by eric-s