You are way more ambitious than me. I keep planning on making a doohickey attached to the cover plate on the tool turret so I can have individual nozzles at all four corners but your approach is much nicer.
Your modifications to reduce interference between the turret servo cover and the tailstock is also nice. I do not use the tailstock much but the few times I have it has been a nuisance. Also I have a couple of times pushed the tailstock off the end of the bed by moving the carriage back with the X axis in a few inches. You are now less likely to do that.
I just looked at your coolant line modifications again....very elegant.