The main board is going to come fully assembled, it is full of super small, super fine pitch parts that are essentially impossible to solder by hand - even with a hot air soldering station.
There will be some adapter boards to go between the main board and the connectors on the top plate, these may or may not need some parts soldering, not quite sure yet.
Then there is whatever it takes for power supply.
The upshot is that it should not be a difficult build. Probably a few connector soldering and mounting boards and running cables between connectors on boards.
John S.