remove / replace cill for french doors

I have a pair of French doors with 2 fixed side panels, the cill is completely rotten with a small bit of rot on a couple of uprights where jointed into cill. I was considering cutting these out and replacing in situ rather than taking the whole frame out, but it seems a bit tricky re aligning and jointing the cill with the frame in place. Is this the best/worst way? Is this what the experts do? I've done a fair bit of joinery so I'm ok with the jointing etc. Anyone with experience of this? Any suggestions will be very gratefully received.
John
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John,
No expert on this but I am rebuilding two sets of French doors (see earlier post) for my niece's house. What I found is that if the threshold (sill) is rotted out, the bottom of the window panels and the door jams may also need repair. I think it would be far easier to take the assemblies out, do any repairs, then reinstall them. A couple of pieces of ply screwed down over the opening would cover the hole while you did a proper repair.
Bob S.
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