Woop woop! Looks like I don't need DOSBox after all of that, (I got rid of the levelpak.dat folder), and I've fiddled around with that level now (Although it's mainly the starting point and skills I've changed, the rest of the level is practically the same with some minor differences). I'd put it back up, but it's going to be part of my now WIP level pak!
Thanks for the help guys, see you in the Custlemm topic!
(Oh, and how do you get your own music to play on it? I've put MIDI's on a CD and had it in while running Custlemm, but they didn't play. I'm using nocdlem at the moment, but the music's a little tinny.)