Hi Leo & Bojan,
I started on the same idea a few years ago using fast Nikon 400mm f/2.8 and 600mm f/4 lenses and have 99% of the stuff, if I max load an NEQ6. Unfortunately it's still a work in progress due to no observatory, time and other commitments. I should post an update to my older thread on my array/s as I now have the 3x lens adpaters and some astrocameras...
A Tale of 2 Arrays
Best
JA