the Roskopp was everywhere in the 80s.
and i think this would fall under "homage" and not rip-off. i doubt Santa Cruz and Phillips would see it that way, unless Scott somehow licensed it from them (Santa Cruz/Phillips seem pretty serious about its copyrights)
from an industry that has always prided itself on rip-off art and homage, i think its pretty funny how up in arms people get when someone bites something of ours