The Zero colour is referred often as Olive Green or Grey Green and has a slight tannish color the fabric surfaces are a Light grey colour and the Zero has an overall Glossy finnish.
BII-124 also has Dark Blue?Royal blue bands and stripe, this colour is well represented on the decals you have purchased Cory, I have the same set. You will note in the tamiya decals how different the colour of the blue bands are in comparison.
Tamiya primary Mixes I used is as follows in the image below,
Metal surface Colour
Flat White XF-2 :100
Flat yellow XF-8 : 24
Flat Black XF-1 : 11
Flat Red XF-7 : 2
Fabric Surfaces,
Sky Grey XF-19 : 105
Khaki XF-49 : 20
Lt. Sea Grey XF-25 : 15
Cowling is Blue Black
Flat Black XF-1 : 7
Royal Blue X-3 : 3