At this point, do a test measurement to ensure that everything is set up correctly and to see if the accuracy is good.
Use a test part, something like a 700 mm sized test block.
Tilt the part in 3D space.
Measure the part using an alignment.
Reposition it in different locations inside the machine volume.
Measure with a single arm.
Measure with both arms.
Compare the results against measurements done on separate, single-arm machines.
The next step provides information on mapping the other extensions.