well this kit def. involves a lot of pre-fitting , btw the roof shell needs to stick out at the front insted of the back  
just tyake it slow and testfit a lot and make sure everything fits together .. i build one and would love to do a nother 
 
maybe some idea's of contrasts between the parts wil help ? 
 
to start with this is what the grille looks like out of the sprue 
 
 
 
take some black paint (enamel?) and paint everything inside black , dont worry about spilling onto the top chrome and after every brush wipe of the paint with a cloth (flat over the grille) 
after a while you get this > paint stays behind in the ford logo and grille area > makes it 2 times as realistic 
 
 
 
if you give the chassis a color paint the floors black for contrast 
 
 
 
and when your bed is assembled with the fenders and painted in the body color paint the underside and inside of the wells black , just easy going with enamel and a hand brush 
 
 
 
here you can see that the side plates will be black and the underside of the cab in blak will fit onto that and create one black underside under the cab , i also painted parts chrome , (handbrushed) 
 
 
 
you can do the indicators orange 
 
 
 
on the interiour you could go through with any colortheme , for the small vents you can use a pinty tooth pick or wooden sate stick , dip inpaint ans gently touch the parts to paint 
 
 
 
giving the roof a different color is also nice ... and i painted the whole engine compartment black and behind the grill section > black , just used a small hand brush and black enamel paint and patience 
 
 
 
when you clearcoated the body you could make a watery black wash to paint the panellines darker , same as on the grill paint the line and wife off excess paint 
 
 
 
the kit inclused a batterie , i suggest keep it white and paint the top black , you could ad a brace and some wires