"bio-mechanical beauty that is both physically sensual and intellectually fascinating"
I hate to be Wally the Word Worm, but things that are "sensual" are physical by their very nature. Also, something that is fascinating is always beheld with the intellect. Hence, "sensual and fascinating" would suffice (that was painless, wasn't it?)
Anyway, I've always been fascinated by Giger and have never sensed anything remotely akin to a "creep factor" in his transcendent artwork - Pierre Matter's work (on the other hand) seems quite creepy and on the level of some sort of pseudo-sexual animal fetishism...sort of like weird voodoo totems that unpaid extras would carry in Cecil B. DeMille movies