Great concept!
I love this type of interaction, Bill Gaver style. It opens up possibilities for not yet known relationships and sparks conversations and ideas.
The form can be the carrier of feedforward and feedback here too, for example if you turn the radio upside down, will the volume still go up when pushing the control upwards? How to turn it off when the user loses the control is another question - it probably needs a spare one.
Sound quality will be very important because the use of materials elicits a high expectation.
As for your craft - you can improve on foam board modeling: www.cardboardmodeling.com
Always cut your sandpaper instead of tearing it, and never leave the cap off your superglue when not in use.