Did not look at the photos but it sure sounds like you did it right. My install.
I have a 2,000 watt ture sine wave in-line type inverter (This type also contains a converter and has both a 120vac IN and a 120vac OUT)
It feeds a 30 amp sub panel, same as you did, Since it contains it's own transfer switch I did not duplicate that function.
I like my original equipment converter (Progressive Dynamics 9180 with wizard) slightly better than I do the one built into the inverter so I disabled it at the remote panel.. But it's a very good feeling having it there as a backup incase something happens to the PDI (Like I accidently pull the plug.....again....) Has come in handy.
Home is where I park it!