Well, I had the muslin cut out to check the fit of the shirt and I went to my trusty ol'
#66. Unfortunately, I discovered that my drive belt had snapped. I figured, "No problem, I'll just 'borrow' one from one of the project machines." (Those are my thrift-shop finds that need some work.) I had forgotten that I'd already done this, twice before. So it was off to the fabric store, where they had one belt in stock. When I got home I replaced the belt and spent a couple of hours giving the poor old thing a thorough cleaning and oiling. I even disassembled and cleaned the light fixture...there was a LOT of glunk on the inside of that glass! Naturally, once it was all clean, the bulb promptly burned out. I picked up a new one later in the week.

Back to the shirt.
I assembled the muslin and found that the length on the medium will be adequate, but it needs to come in just a smidge on the shoulders. All I need to do is increase the seam allowance and it looks pretty good. So I was ready to start work on the real thing.
I began with the front right side with the inset panel. After sewing the three pieces together, I pressed and rolled the seam edges into a false french seam.

Then, I pressed the the rolled seams and stitched them down from the outside.

The panel looks pretty straight, we'll have to wait and see how it hangs on the finished shirt.