A lot will be dependent on the bridge you plan to use and its string spacing. Going for that sort of construction, it's worth looking around for a good bridge where all 12 strings can be intonated. But there's no point going for a wider neck to help fit all 12 strings in if the bridge still forces the strings to be the same overall distance from top to bottom E. You can of course decide to have a non-tapering neck, which will make the spacing at the nut a bit wider, or a much gentler taper than normal.
Also, if you plan to use standard Tele pickups, then the neck can't really be wider than a couple of mm from normal otherwise the strings will be too far from the pickup poles. If the spacing is wider, then maybe use blade type pickups (e.g. Joe Barden types) so that the difference isn't visually obvious.
Last edited by Simon Barden; 11-09-2018 at 05:41 AM.