My friend Bobby B, of the Renaissanced Bicycle group just showed his in-progress Gazelle.
He’s changing the wheels to a modern 3-speed with drum-brake and a drum-brake dynamo. I don’t think the fork-crown is even drilled for a brake, since it used to be a coaster-brake one-speed.
He modified the chaincase to allow for the rear shifter mechanism, and also removed the chainwheel cover to show the leaping gazelles.
Beautiful, spare lines, and I think the rear rack is lovely.