Replying to Winches

So in may ski movies/ edits I see these huge urban setups that I can't imagine being made possible without the help from a winch. This year my crew and I did as much urban possible with a 10ft banshee bungee but are for sure ready for an upgrade to bigger and better setups. I wanted to know if in all of the sick urban setups you see in these edits are from winches made themselves or winches they purchased? Or If they're made by themselves, how do you make one?(Video links, parts needed, is it do-able yourself?) Or if they're purchased where are they getting them from? Also in the end cost is a biggy so if you do have a good response for me please include that, thanks.

Also would a 20ft banshee bungee be a better investment and get the job done just as well?