Just go ahead and make the tailpiece. Whatever is on your mind that day, follow it. Make a couple and test out your own ideas and other folks if you value thier opinions. It is a pretty manageable task that can be done fast and doesn't require a lot of tools or skills, and the cost is very low. Even if the first one doesn't come out just as you had envisioned, you can make another one (or more) until you hit the right combination that satisfies you and the bass it is going on. One of the biggest things to remember is that five different tailpieces will sound different on five different basses...
I just got back from a gig about a half hour ago. One of the folks at the session noticed that the tailpiece on my bass was different than the one I had on my bass last month. Try as I may, he just wasn't making the connection that I literally have a box full of them and switch them out like some folks change their clothes.
Here is a link to one of my more recent and there is another at the beginning of the thread:
james' bass build
If all goes well, you may even make a few pennies selling some after you get the hang of it....
Good luck and post some photos for us.
j.