Yeah, I modded a few of them. One for myself (got it "broken" fixed it, then modded it for XBMC). I modded several for friends because "soldering is scary". Well, it is if you have never done it I guess. I didn't care what they wanted to do with it. I just made it work for them.
I used mine as a media center. I used my PC for gaming.
I am very sure that I had at least one with a Xecutor too though. Old spinning rust drive but not that big. To expensive for me.
It was the biggest I could afford at the time.....1TB was way to expensive.
Man. Even asking for my friends to pay for the modchip and xbox + like $20 for the work I only had a ~200gb drive in mine. Some of the guys I built them for had full 1TB drives.
Know your worth is something that takes time. I also would not pre-load a drive for them with games and shit. I would make it so it was ready and show them how but I would not do it myself.