I live in a flat and there's a huge tree in the back garden which we all
want to get rid of.

We also want to make one side of the communal back garden a bit nicer as
it's an overgrown mess at the moment and we're talking about putting down
plastic sheeting to suppress the weeds then some bark chips and finally
tables, seating, maybe a BBQ etc

If I can find someone to take down the tree safely is there any reason why I
couldn't just hire a chipper and use the tree to make the bark chips we
need? If so, can I chip the whole tree and use it or just the bark? Sorry
if this is a dumb question!