Re: cafe style seat on a beach cruiser??
If you have metal working skills you could build a seat frame. I don't pretend to be an upholster so my seat looks like the amateur job it is but the frame is stout. I used 1/4" X 1" flat stock and a short stub of 1" round stock for the seat post. Plywood for the base then some high density foam and vinyl. Someday, when I paint this bike, I might have a real seat cover made for it by someone who knows what he's doing.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"