for small projects, objects the nextengine probably works great...
to scanning an object like a car sized, you need different type scanner..
virtually even the Kinect hack should work.. because after you have a model, you can adjust it in any modeling program.. or pull on a new topology..
since scanning output to stl you might can use the meshmixer by autodesk... a free program to aligning meshes together.. and making Boolean operations between..
a ready to go system very expenses...
somewhere between the lowcost lightscanners, and creaform what is high cost, theres the Konica Minolta... about 14K...
on other hand you can get 3d model just about all exist vehicle..
then you have a ready model, and you can start to match the model to real life cars.. and this would be the most affordable to start..
from scan you pull to meshmixer.. put together the scans.. reducing triangles
then you pull into a modeling p[rogram like maya lite, (30 dollar per month)
then you can create your model, you can use in solidworks if anyway like that..
actually you need a program that can work with mesh and solids at time.. like fusion 360