/!\ FOURM POST UNFINISHED /!\

so you probaly would know this i built to show how to do the block challange

lets fuselage it
first you get the plane

take out the cockpit blocks
then make it a subassembilly
then you want to place it into the fuselaging challange

then replace the cockpit with the correct one
but still, its still blocky
so replace some blocks with fuselages like this: