A while ago (9 months) I finally installed auto bed leveling on my Rigidbot, I should have done this years ago!
I found a fan mount on Thingiverse and liked the original (modular) idea but wanted unobstructed acces to the hotend, so I created a different fan duct. I also included a mount for an inductive probe I had laying around for months.
For the E3D hotend I used the Nautilus mount before but was willing to trade some Z height for a better view and acces to the hotend.
The fan duct is designed for easy printing and has great airflow. The probe mount is placed in a position it does not waste any build volume.
I have published the design on Thinigverse.