post a screenshot please, so people know what to expect.
(1)
postprocessing the scanned data is the first step. Rhino is not the most powerful software for this. shrinkwrap might help. Make sure the meshes are closed - this will allow more workflows to play with. Create a low resolution version to find the position and to experiment.
If you have a workflow that suits - you can try if it works with the higher resolution. Or just replace the data after the position is found.
(2)
there are a few topic about 3d-nesting - not a 100% match but maybe a starting point:
(2b)
search for a service or specialised software that does the 3d-nesting / maybe use the trail version.