I'm not sure any specific attachment to hook it up to a corny exists. I'm sure it would be easy enough to get some tubing running from the engine with a corny liquid out QD.
As far as serving, you have a few options. For a true certified cask ale, you have to prime the keg with sugar and serve via the engine at cellar temp. If you don't plan on drinking the beer quickly, this can pose some problems since you will be pulling oxygen into the keg. If you aren't concerned with the requirements set forth by CAMRA, you could always hook it up to CO2 at a very low pressure. That way, when you pull beer, the headspace will be replaced by CO2 rather than oxygen. I'm not a member of CAMRA nor do I have a lot of experience with cask ales, but for a home setup which might not get drunk within 3 days of tapping, the latter option is a perfectly acceptable option.