Hi low end fuzz, I made my own wood bridge for my mahogany fretless. rosewood bridge String through body with individual saddle all made from rose wood, so i can intonate every string proprely. I did not have any machanism to adjust the height or the intonation. I simply move the wood saddle to adjust the intonation and the string tension keep it in place just like a violin. For string height, i took a fine rasp and sand the bottom of the saddle. nothing had moved and i play this bass for 2 month. The bass sound realy natural but dont exepct a snappy fretless sound à la Jaco, it will sound much more like a cello. My string are grounded by a brass plate insert in the back of the body. brass insert I dont think the brass plate affect the sound, anyway you have to make a strong achnor to keep the string tension. And making your own bridge cut the hardware price!
I hope this will help and good luck!
Philippe