I see blacked out Avys on slides all the time around here ... it's not exactly a creative stretch after seven years of NNBS Avys.
Plus his looks a lot less modded than yours, with the roof rack still on, stock height, door moldings on. It's basically an LT with slides and some painted bits on it like the grille trim and badges.
I wouldn't sweat it too much if I were in your shoes, in fact I'd be pretty happy that you've only seen one other of these. Plus yours looks a million times better.