With all the major shaping and sanding completed, I had one last task before glue-up, and that was to pre-drill the seat frame for all the L-nails.  The nails will go in after finishing, but it is most convenient to pre-drill now. 

To work out the nail placement, I had to plan out the number of warp cord pairs I wanted to spread across the width of the front/rear stretchers.  Ideally, there is an odd number of pairs (so that weft cord are balanced on either end where they either go under the warp or over the warp), and there should be either 4 or 5 wraps around the stretchers between warp pairs.  So, you start with the length of the stretcher that will be woven and the fact that 7 strands of Danish cord will cover an inch of the stretcher.    I worked out the numbers for a few variations until landing on the final pattern.  You can see my chicken-scratch calculations in a couple photos below.

With the warp cord nail placement interval worked out, I made a few templates so that I could lay them out once on the template, and then transfer the locations to the seat frame using an awl.  I used some scrap 1/4" ply for the templates - the large holes were from an earlier project.  There was a template for front, rear, and side stretchers.

The side stretchers will have nails to hook the weft pairs.  They're spaced 1/2" apart and staggered to avoid adjacent nails being driven in along the same grain line.   With the oak, there's not a great chance of splitting the wood, but it was no trouble to take the extra precaution.

With the template clamped in place, I used an awl to transfer the nail locations.

Distinguishing awl marks from borer holes took some concentration in a couple areas.

To avoid that issue, I taped the remaining stretchers before transferring the nail locations.

Then I pre-drilled the holes with 1/16" bit.

After a little sanding to get rid of the nubs, It was time for glue-up.  And, it's always nice when that is anti-climactic. 

That's a big milestone in my book.