I was certain that either 'Aki-Asahi,' or 'Camera Leathers' had kits for RB's, but darned if both
companies no longer show these kits available.
You might try contacting them to see if kits can be ordered; availability of hide/leatherette choices.
Below are some step-by-step images for recovering a Yashica TLR.
I know it's not your RB, but gives you an idea of the process.