I made one a while back, I don't know if it's what you mean by quill type but I used a wedge design from a threaded fork and it works fine, just let me find the pics...

EDIT: Found them:




All I did was cut the bottom of the post to a matching angle with a angle grinder, and quickly touched it up with a bench grinder, I found a large quill for the bottom and ground the edges so that it would fit down the seat tube, I then took the topcap for a stem and press fit it in the top of the post.

It works well, I only ran it for a few days just because I could but overall it's a solid design. Hope this helped.