Sorry what is the 3' part ? I see 6' wide french doors and 6'6" windows IMO the french doors and the windows should all be the same size and for sure the french doors need to the bigger of the two not smaller .

Yes, I should have specified differently(it's been corrected). Would a 6'wide french door between 6' wide windows be adequate considering the length of the wall?

The simple answer is yes. But where do the french doors go? And what is the view?

I like the symmetry of three six windows/door in a row. Possibly make them taller unless you are trying to avoid the additional cost of tempered glass.

It is the rear yard. Nothing exemplary about the view...unfortunately.

Can the doors be centered between the two windows? That 5 inch discrepancy would drive me crazy.

Yes modification will be done to center the door between windows.