Here's my big issue with trying to describe how to build a gun on line: we are discussing the details of the build using the written word. The written word is open to interpretation.
A gun build is a physical process, one that requires placing two or three objects together to see how they will relate. This is very hard to do for you from where I sit, because all we have are words. You and I don't have the parts in front of us at the same time, where I could SHOW you how and why.
A helpful tool is a digital camera, post your questions along with your pictures. That helps a lot. But it's still not as good as in-person, hands-on, building lessons.
As a side note, I often photo a gun as I go thru the various stages of building. I recommend you do this, too.
For your questions, you may draw on your stock, with pencilled in drum location, or lock outline; you may simply hold the trigger guard in place while taking the photo; place a stick note with an arrow pointing to your dilemma. You can even take an existing digital photo, and add arrows in a drawing program, or scan the doctored up photo.
This is still not as good as hands-on, in-person.
Also, this can be frustrating, because folks (self included) don't always 'get' what you're asking. Try to construct your questions clearly, and SIMPLY, and to-the-point.
That said, I will continue to help, but I recommend you keep up your studies, and see if there is a builder nearby who can give you some guidance.
Tom
Some photos, like this, are worth a million words. Keep your barrel square to the lock face as you inlet it. Since you have a pre-inlet bbl, this does not really apply.