Jaeger
That someone better
3.0 used very similar DCs to WEG SW as well.
Last played D6 long time ago aka last year.
FWIW:
STAR WARS D6 (1987)
Difficulty number chart:
Very Easy 3-5
Easy 6-10
Moderate 11-15
Difficult 16-20
Very Difficult 21-30
CP2020 (1993)
Task Difficulties:
Easy 10+
Average 15+
Difficult 20+
Very Difficult 25+
Nearly Impossible 30+
5e D&D (2014)
Typical DCs:
Very Easy 5+
Easy 10+
Moderate 15+
Hard 20+
Very Hard 25+
Nearly Impossible 30+
In my opinion; game design does not happen in a vacuum, the progression is rather clear. I find it rather interesting that 5e DC's, and CP2020's Target numbers are essentially the same with only some slightly different names used.
If one did not want to use levels as the advancement mechanic - You could knock up a skill list and basically re-create CP2020 using 5e's underlying d20 'bounded accuracy' system, rather than interlocks exploding d10...
In my opinion it would be a rather straightforward from a design point of view. You'd really only have to decide where you wanted to fix the HP for the PC's.