Truck Improvements

Grill

Select polygons on front of vehicle - remove to create hole - manipulate vertex to create accurate boarder

use msmooth to generate more accurate profile. - select boarder - hold shift pull inwards - generate geometry for inside of grill

Create cube - change settings to generate strip - rotate to generate appropriate angle.

tools - array - create vertical array many elements in vertical direction

Add splitters (cube - narrow strip - place as appropriate)

Light casings

Create cube - 2 segments (shaft)

Select both side polygons - inset , by polygon - move polygons inwards to create hollow case

Manipulate shape and move into position

Hide front hood part of car - select inside side casing geometry's - delete - this leaves a border around floating back inside casing polygon + inside edge of front of component of each hollowing - select inside edge of front of component

 Cap - detach - extrude - move away (in single plane) away from casing

Select inside boarders - bridge to replace previously deleted geometry

Unhide truck components

Manipulate casing to fit onto truck correctly

Symmetry to create duplicate for alternate side of vehicle

Cage to hold lights on roof

select roof polygon - inset - select created boarder - extrude

Select outside centre polygons - delete

Bridge open edges to re seal geometry

Main spinning lights 

Cone - top diameter greater than lower - select top polygon - inset - extrude - inset - select boarder - extrude

Delete boarder

select inside boarder - cap

select outside boarder - cap

Turbo smooth