Great work dude . The offer of the headless neck is still there when/if you get round to it . The idea that you can make such a thing of beauty , but reckon that a neck would be a step to far is alien to me , but everyone has their areas of expertise i suppose . I wouldn't have a scooby where to even start with 3D printing .
No need to be too wary of chinese necks . Who is the seller ? . I've bought a couple over the years and after a bit of finishing they have been fine . Both of the last two have had fingerboards removed and replaced with homemade fretless ones . I do think that you may be a bit tight for 18mm spacing with that neck but would not hurt to have a measure .