Rather than post a new update when the head is printed I'll add the pictures to this thread so come back here to see any updates.
A link to the brass hot set inserts is on the previous post.
Brass pan head m6 x 30mm screws for securing the neck
M6 x 12mm x 1mm Brass Washers for the screws for the neck
The centre section of the neck printed and the carbon rods that will align and stiffen the whole thing.Time will tell but using 8mm carbon rod may prove better and less prone to bending, I am hoping the fretboard will also add some rigidity to the final thing as well.
Fretboard fits really nicely. There's room for improvement on the neck width but I'll leave it for sanding and finishing