Fireside, I believe in easy to use modellers!!!! Make human is GREAT!! Im sure your models look great, its not that hard, and its heaps of fun.
Say you have a dashboard, steering wheel, bonnet, all the fairings, and all you had to do was slap them together, then you have make car! Thats how voxels work, you buy the premade kit then just glue it together.
I have 3 techno kits I work with now installed, Theres enough there to make transformers, factories, skeleton robots, all sorts.
Voxel boolean objects are fantastic for mechanical shapes, so easy to use.
About the vertex count problem->
I dont mind the huge vertex counts, you can always mip them to distance, didnt unlimited detail proove we can render the whole thing in point cloud these days?
In fact, if you connected your models together at joins (like maybe some kind of portal entrance) you could model the entire universe in 3d coat by connecting together hipoly 3d models you make separately