If you have ever been to a multi rotor race (some times called a heat) there is a vast array of custom built racing drones all with there own selection of components. The top competitors and YouTube freestyle stars like Skitzo and Mr Steel are almost fully custom builds and not turn key “consumer grade” machines
Usually pilots are in full competition mode and deciphering what makes up a given machine can be a challenge.
I found the Rotor Builds web site on the rotor riot Facebook page.
On this web site multiple custom multi rotor builds are listed all with component list and links where you can buy the components.
While my old trusty and still flying ZMR 250 is still flying it’s 2014 technology. Like “dog years” this is down right medieval level.
I found the rotor builds web site to be quite informative