I decided that the floorboards needed to be made.
First, the ash planed to 1/4 in was cut to size.
OK - here's the kicker. The floorboard drawings that I have are wrong. Paul Dougherty warned me about this so I did the next best thing - I took drawings off his Jenny! Hey, it worked for him and he measured a bunch of other original Jennies which saved me from doing it. Anyway, the floorboards were cut to 7 3/4 in. width. The front length was 27 3/4 in. and the rear length 29 in.
The drawings commonly found are from a JN4-D2 which is a little different than the JN4-D. Same goes for the floorboard support drawings. They are incorrect.
The floorboard supports are spruce cut to a uniform 1" thickness. It also has a 2 in. radius curve to rest on the longeron. Since there are several supports, I made a simple pattern.
Everything was cut to shape on the bandsaw.
And sanded to the line on the oscillating spindle sander.