Warmoth Deluxe V neck heels are too narrow for 19 mm in my opinion. Spike@Warmoth said the Deluxe V is a 17.5 spec'd item, however I have used both 17.5 AND 18mm bridges (Hipshot A) with great results. Choose the bridge that gives you the spacing you desire. The neck itself isn't any narrower for a 17.5 or 18 or 19 for that matter, so there isn't a "17.5 neck" per se. The bridge spacing and the neck/nut width are the variables that determine spacing at both ends of the neck.
I am preparing to build a fretless Deluxe5, angled headstock, Nordstrand P/J and the Hipshot A-Style 17.5mm brass bridge.
17.5mm (11/16") is the string spacing for my Stingray5, which I want to match.
Warmoth does not sell this bridge, so it must be found elsewhere.
Hipshot is VERY proud of this bridge, cuz they charge just under $150 for it. I have not found an online source yet.
John@Warmoth says the angled headstock provides a tighter B-string than does the Fender style headstock.
Angled does not require a string retainer, where the Fender style does.
My recently arrived Strat 12-string is fabulous quality.
Warmoth did the black-red-yellow burst for me, and the finish is every bit as high quality as my SR5HH.
I expected the dual steel rod neck to be heavy, but it is not.
Warmoth will located the bridge J pickup closer to the bridge for what they call a '70s location.
This is an extra fee, but I do not yet understand what this does.