I am almost positive I've seen one in the "Owner Bios" section of this website. Look around. It will look a bit odd but I don't think it'll be bad looking at all. Although I have the roll bars, I usually have the door tops on my soft top D90 when I take the top off and it doesn't look bad at all. If I find a pic, I'll post it here. Goodluck!
James, just found one for you. A fellow from the UK, Andrew Silcock has a bio here. Check it out, he did what you're trying to do.