I thought I would contribute to the forum on one possible solution (you can do it however you want) for mounting the BlueRobotics OpenROV Compatible Kit to a v2.7.
As you can see from the attached pictures, I deviated from the posted tutorial and mounted my horizontal thrusters to the top of the ROV frame instead of on the sides. I was concerned with “rolling” the ROV if they were mounted on the side walls. Luckily the v2.7 allows one to do this, not the v2.6.
I started by positioning one thruster at a time using just the back screw hole. I also used calipers to ensure both thrusters were placed the same by making light etchings in the frame.
After I was satisfied, I drilled one hole for the back screw and mounted each thruster. I then installed the inner frame and checked to see if the thruster was straight adjusting as necessary and then marking the remaining three holes for each thruster.
As you can see, I got very good results and I am confident the thrusters are mounted straight even if they were “eyeballed” in.
I’ll be working on the vertical thruster next!