Conservatory cill replacement

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i have a home built wickes hardwood conservatory
It was mid way between a kit and full build, with some premade components to be assembled to instructions and bits of timber that you'd cut to instructions that included under/over measurements so they'd fit into the modular build

I will try to add pictures

It was basically a wooden cill build onto a brick base, fitted on three sides the fourth being the house. Then timber frames were added and later filled with double glazed units
The front has a wooden patio door with a slightly different cill profile

The cill was profiled so that the frames fitted onto the cill with screws and mastic
At a corner, a post fills the gap

I built this 30 years ago so a bit rusty on the description

Now, a cill has rotted, and a gap has opened up on the corner . The corner post has also rotted a little at the base

I would like to ideally replace the cill at least along one run, into a 90° corner.

I have access to a workshop saw bench , a router, a festool circular saw and festool chop saw

My basic question is how to achieve a cill profile that I could somehow insert from outside to under the panels, and how to hold everything up without sag while I do it. I could add a wood block to the inside then use a prop to hold the structure up?

With the corner, rather than replace the entire post, should I remove half the post by cutting the corner with two vertical cuts, then insert a new piece of timber, or concentrate on replacing the entire bottom where it has rotted? And scarf (?) the horizontal join by cutting/sanding the area?

I presume that getting a premade cill as a basis to modify is better than stankrting with a massive chunk of timber

Sorry for the long winded question
 
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A bit tricky to answer without pics.

Do you mean the cill section was either part of the bottom of the frame, or was fitted underneath the frame.

If so, I would cut off the cill flush with the framework with a multi tool - fein type and make a new cill projection and face screw it.

If you were near sussex Id offer to machine up an iroko cill section for you.
 
I will try to get some pictures together
I still have the plans somewhere that show a cross section of the cill with luck

The cill was fixed with frame fixers to form a ring around the base then the panels screwed down into it
The floor inside is ceramic tiled

My concern is getting a good fixing for the new cill - the original has quite an overhang - into whatever is left
I didn't think of cutting the cill off flush with the face of the panels and fixing a cut down cill back on

I should have said that I also have a Bosch multi cutter

Pictures and scans of I can get them to follow
 
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I would say its past it's useful life, had one myself for 20years before it stated to show signs of rot, demolished it.
 

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