Costumes & Cosplay
Kaiju Suit Project - Zinogre
Wow, it's really coming along! Thanks for sharing the updates.
If you want the tail to slide over the floor you could put a low friction plastic (like delrin) underneath. I've also seen some folks use caster wheels, or ball casters.
Another option is to use a thin monofilament line from the end of the tail to the back of the character to suspend the tail. It will be somewhat visible, but not from a distance and is easily removed in photographs.