Hi Jackson. Welcome.

In regard to setting out the bridge, measuring the full scale length from the fretboard-side of the nut is better than 12th fret x 2.

I would say your headstock design would be fine. The only point I would check is the distance from E & B tuner holes to the narrowest part of that upward curve (IYKWIM).
My teles range between 16-18mm from the bottom edge of the holes perpendicular to the apex of the curve, if that makes sense.

Here are some headstock templates you can use to compare (and still do your own thing).
HEADSTOCK TEMPS

FYI: if using those templates, don't worry too much about matching the tuner holes exactly. The kit tuner holes are not the same spacing, start/end positions as genuine Fender headstocks. However you can still extrapolate the shape from the template to get what you're after.