The model only uses existing pieces to recreate the dessert camouflage look of the 3 Tumblers used by Bane in the modern epic The Dark Knight Rises. The model could be more accurate by substituting the following parts with tan versions but those have yet to be produced by LEGO or are extremely rare:
3x6 Wing plates left and right version
4x4 curved front slopes
Pantograph Train part
1x2 plates with 1x2 SNOT on one side facing upwards
1x2 slopes bricks with grille and no studs
1x2 plate with two bars
2x2 plates with technic pins on the underside
The model also uses a 1x1 plate with clip on the side in reddish brown (old dark grey in the partslist) which does not exist in official sets but can be bought on Bricklink as it had an unofficial production run.
Transparent yellow/green/red and most of the black parts can be substituted by versions of any color as they are hard to see in the final model.
All three of the Tumblers appearing in the movie have the same colorscheme so there only need to be design updates for the different weapons/turrets of the Tumblers to get the most accurate LEGO Tumbler army.