Haven't read this thread, only the OP's...
I will add pictures late since I have 2 of the 3 out at the moment washing them.
I have a 2011 Chevy Avalanche and we use 3 Nauti's that are FF. They are all installed with the seat belts. It is a tight fit, but it works
No, I am not a tech, and no, I havent had them checked by one since there isnt any in my area... Except for the cop that I went to last time and he asked me to come back so he can find out the answers to my questions. lol... But I have had them looked at by my sister, and between her and I... We are pretty uptight about car seats so I am just about 100% positive it is correct