Nah.... not complicated at all
Goto View>Zone>Set and draw a box around the area you want to render in the camera/perspective view
If you want, you can draw a grid setup in any paint program and load as a backdrop in the camera view in wire mode. just set zones according to the grid using a different part of the grid for each copy of Imagine. This helps set up several copies repeatedly.
Also, when you finish and composite the bits together, you may find a couple of gaps where you missed a few spots. Just load the composite up as a backdrop and set zone to render the missing bits.
You should set zones to overlap by a couple of pixels to try and avoid missing spots