OK I think I got what I want
on the meanwell
-V is not connected to earth/chasis
so what I worked out is
+5 red on antec to hot/red on tec
either black from molex on antec -5 or -12 to +V on meanwell.
-V on meanwell to black wire on pelt.
this should give me 5v+10-15v or 15-20v adjusted from the menawell
lol sounds easier than the voltage mod's I do on my $400 VCards, but I still am catious