Building a DAB radio

I'm sorry to start with this, but I know nothing about radios, so please be gentle! However, I want to build my own DAB radio, and the fascia has to be no more than 110mm in diameter (round fascia). Is there a place online for me to visit to purchase everything required? Obviously, I'm looking for a 'module' that's already complete, and can be adapted to fit in the 110mm aperture - adding speakers. Many thanks in advance for any replies.