Bit late, but after I publically posted this - I finally got a response from him via IM. He claimed he'd send the mock-up to me via email that day, but never did. Almost two weeks later, he responded to my TFL PM stating he wasn't sure which project I was talking about.

To late to try to get a refund via PayPal, but hopefully others will be weary in transactions with him. Another reason why I hate paying for work upfront, though I understand why most freelancers prefer it.