I don't think so - the required signals are not externally available with the components you specify. But if your aim is to put together a TV HD recorder, you can get internal TV cards and external tuner units which would work with your computer to provide the same functions. And you can probably store the (TV) programmes on the external HD to avoid filling up the internal disk.
I think PCA did a review of suitable units last year. If I remember correctly, the price was typically £50-£100.