There's a guy who sells Korean made 7 string hollows and semi-hollows. Matt Raines. I belong to the 7-string guitar forum, and I asked about the Raines guitars, and from what I was told, they're kind of hit and miss at times. Some players have had good ones, other have wound up having to deal with fixing issues their Raines guitars had. Here's the website for them:
http://www.mattraines.com/pages/cfHome.cfm
Moi? - I wish I could find one of these, and afford it:
It's a Gretsch George Van Epps 7-string. They were made from 1968, until the late 70s, and are probably the first production 7-string guitar. they were never very common, and the last one I saw, went for $2500.
Of course, there's always the Schecter Jazz 7. It's no longer being made, but I've seen them going on eBay for about 400-$500. From what I've been told, they're so-so guitars stock, that with a little bit of work, can be made pretty good players. I still keep an eye out for them, when the mood strikes me.
Ibanez also made a 7-string - the AF-207, but they're even less common that the Schecters.
So, like a growing number of 7-string players wanting a hollow or semi-hollow 7, I'm stuck with my solidbody (a Schecter Omen Extreme 7) for now.