First of all, thanks to all for your comments and insights. Greatly appreciated.
Ok. So I believe pictures can explain better than a thousand words so here I go. Please ignore the barrel not being clean yet at the time of these pictures. I had to remove the tape adhesive. Also you may see some chalk residue that I was using before receiving the Prussian blue.
So to start, I believe that the barrel and breach plug are in very good condition. Not sure where TRS gets them but the fit looks really good and no adjustment needed as to the plug length or breach. The angle under the tang is already at 90 degrees and I don't see no adjustment there:
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I have also noticed that the tang already has a taper almost mid section towards the back, so maybe in the end there will be no bending required but just some filing towards the back and overall.
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The back of the breach bolster is straight. I am good with that, but I did see on some rifle building videos that sometimes it is tapered inwards towards the bottom. This complicates inletting but was wondering if it is necessary or historically correct. I do not want to cause me additional work for nothing. I'm glad to keep it straight if there isn't a real benefit in tampering it; even because that feels like a complicated filing operation.
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The plug screws in very nicely and tight. In the pictures I have just slightly tighten them by hand to see the fit.
The funny part is that this thread has already confirmed my reading experience around breach plug installation and lubrification. I have one response saying that you need anti-seize lub like Copper grease, and another saying that no lub is used (1-1) it's a tie. I am willing to use the lub as long as it does not impede performance or powder igniting towards the breach face. Funny how you find multiple posts on how to remove a breach plug but not on how to install it! Including if to set hand tight or use major torque.
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Of course the barrel needs inletting. Out of the box it looks like this.
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Now my question about the facing of the barrel to accommodate the lock pan was if I needed to face even the opposite side. From pictures of originals it is not clear. However looking at how the barrel fits tight on the other side I am not sure the stock will support facing the other side and besides doesn't seem useful as it would apparently serve no purpose at least one I would not know.
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Of course the first step is to inlet the barrel but if I had to face the other side I would have to do it previously to follow the barrel profile. I may be hitting a dead horse here as an argument. However, of course the breach plug needs complete inletting.
And finally a question about the lock plate.
I think it needs straightening. Is it normal that it bends out slightly? It does tend to rock back and forth when inletting. I put the back side of the plate against a file to try to show how strait it is. If I do need to straighten this do I do it cold or does it need heating of some time?
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I am taking this slow and pondering decisions based on the info that I can collect from you guys. Also, I am waiting on a few other tools to come in so I use the right tool for the job!
Thanks to all for your precious insights!