top bars is nothing to fancy. its just beekeeping without frames, just like bees do in the wild. put a swarm/nuc in an empty box and they will do the exact same thing.
over here we can't really use that approach as the frames have to be removable for disease inspection (legal requirement). with a top bar hive you would just smash the brood trying to inspect the comb.
also when you extract honey you smash the comb, so they have to make new comb each year. not necessarily a bad thing but it does waste honey.
This is simply not true. Top bar are removable and therefore are legal in this country.
Top bar and crushing your comb is not the way to go if your commerical, but are great for the hobbyist.
You can't just throw a bunch of sticks across a box and call it a top bar hive.
I would suggest you read up on types of top bar hives from people who actually uses them. Michael Bush, again is a good source.