Overall, you probably would learn a lot of useful and interesting things by
giving it a try. You have the right idea about using spot-welded mesh or
something similar to get a mechancial bond. Concrete doesn't stick well to
flat steel when it's vibrated a lot.

There's a thread with nearly 3000 posts on CNCzone concerning building
machines with steel weldements and using epoxy resin and rocks to fill
and provide damping. Several machines have been built this way.

Karl