that hovercraft looks more complex than I think it needs to be.
a: he is using external fans to cool the engines when he has plenty of airflow from the lift fans themselves... a little porting and he has plenty of flow...
reverse on the propulsion fan is kinda cool but who needs it... reverse on a hovercraft is when you spin the whole thing around and floor it
independant fan control for steering?... not needed either... its more effective to use larger rudders. as it is if you design the rudders right you should be able to spin the craft in place.
but since I have never designed a hovercraft I cant be called an expert so you can just ignore everything I said
..... it does look cool though, doesnt it.