Looking forward to reading about your post-delivery 'mods to complete the trailer'
Mine are different from yours but I can relate to the approach; ETI won't build truly bespoke completed trailers, but they do a better job than most of accommodating the Owner inclined to take them there, IMO / IME.
I hope you have as much fun as I'm having 'finishing-out' my recently delivered 'incomplete' 5.0!