"I may be persistent and attempt to drill holes in the correct position in the front of the Quicksilver chassis."
Unfortunately, it's more than a case of drilling a couple of holes. The modification isn't really feasible, and after you remove the front panel from the Quicksilver case, you'll see what I mean. In the Optical/Zip drive area, the Quicksilver's front chassis wall isn't cut out the same way as previous models were. Prior to the Quicksilver models, the front plastic bezel (with the hinged Optical drive door and a blank or Zip-slotted bezel) was snapped in from the front, after the front panel was installed. The chassis wall had a large opening to accommodate installation/removal of the Optical and Zip drive carrier. As I indicated before, in the Quicksilver model, the Optical and Zip drive carrier is mounted internally. This is necessary because the front chassis wall has two separate openings cut in it. The upper opening is for the oval-shaped, hinged Optical drive door (snaps into place from the interior of the chassis) and the lower opening is a narrow slot for Zip disk insertion and the eject button. To use the Optical and Zip drive carrier from a Sawtooth G4 would require cutting the Quicksilver's front chassis wall, to create an opening large enough for the carrier. In doing this, you'd cut away the metal which has (7) small holes in it, through which the hinged door assembly's plastic mounting pins are inserted to properly position and secure it in place. If you don't want to lose the use of the hinged optical drive door, including the appearance of a seamless front panel, you can't cut away that metal. If you don't care about having a permanent oval opening in the front panel in front of the optical drive, you could attempt your modification. Because the Quicksilver's optical drive typically needs to have the trim piece unsnapped from the front of its tray, I'd want to retain the front panel's hinged door bezel to prevent excessive dust from entering the drive. As I recommended before, check ebay for a pulled carrier.