ILR and Naturalisation date check.
I am a Brit and my wife is on a Spouse Visa
17 Aug 2017: Landed UK - Spouse Visa date stamp on the original passport
6 Feb 2020: FLR(M) approved.
6 Aug 2022 is 30 months from FLR(M) being granted and FLR(M) expires. [edit: Actual expiry 3 Sep 2022]
17 Aug 2022 is 5 years from first landing.
So... the first day we can apply for ILR is
20 July 2022 which is 28 days before 5 years from first landing with Spouse Visa and before FLR(M) expiry.
My questions for the experts are:
1) Does this look right?
2) Our application schedule has been a bit over-efficient

due to travel commitments, so we are tight on the ILR application window. Once the application is submitted and being processed is the FLR(M) validity extended?
3) Is there a definitive list of docs required for ILR - or is it the same as FLR(M) and is the financial requirement the same (i.e. savings). I like to have these ducks lined up...
Many thanks in advance for all advice and guidance,
Matt