I have an SE SuperDrive with two floppies and a HD mounted - bought it here a couple years ago actually. The floppy drives need to be cleaned so I've been meaning to open it up. I'll take a picture of the HD mount when I get into it and post it here. Maybe this weekend, maybe not..

You might be able to fabricate something that would work, but duct tape probably isn't a permanent solution given the heat inside an SE.