This build is not for the faint of heart as it is very involved and my take up to a half hour to complete.

Step 1: Gather Your Parts

Chassis:
3x 1x2 flat
1x 2x2 flat
5x 2x3 flat
2x 2x4 flat
3x 2x6 flat
3x 2x8 flat
3x 2x4 axle
2x 1x2 white grates
See picture 1
1x 1x2 single stud
See picture 2
3x differentials
See picture 3

Back Lights:
1x right angle holder
See picture 4
1x 1x2 semi-transparent blue light
1x 1x2 semi-transparent red light
1x 1x2 police flat

Jet:
6 x flames
See picture 5
4x flame holder
See picture 6
1x jet enclosure
See picture 7
2x 1x2x3 with peg
See picture 8
2x 1x2 slope
See picture 9

Skis:
2x ski strut
See picture 10
1x camera
3 x skis
1x 2x2 flat
1x 1x2 flat
1x 1x2 ski handle
See picture 11
2 x megaphones
See picture 12

Instrument Housing:
1x housing
See picture 13
1x 1x2 temperature flat
See picture 14
1x 1x2 speed flat
See picture 15
2x 1x1 round red light
2x 1x1 round blue light
2x 1x1 square red light
See picture 16
2x 1x2 silver grates
See picture 17

Wings:
2 x wings
2x semi-transparent blue cylinder
See picture 18
1x mounting rack
See picture 19
1x map (optional)

Plow:
2x plow
See picture 20
2x plow harness
See picture 20
1x 1x6 flat
1x 1x2 handle
1x 1x1 grip
2x 1x1 flat
2x 2x2 flat
2x 1x2 flat

Wheels:
6x tread idler
2x tread
See picture 21

Step 2: Assemble the Chassis in Layers

Layer 1:
2x8 flat
2x3 flat
2x3 flat
See picture 2 and 3

Layer 2:
1x2 flat
2x4 flat
2x8 flat
See picture 3 and 4

Layer 3:
1x2 flat
2x4 axle
2x3 flat
2x4 axle
2x3 flat
2x4 axle
See picture 4 and 5

Layer 4:
1x2 white grates
1x2 white grates
2x8 flat
2x2 flat
2x3 flat
See picture 5 and 6

Layer 5:
2x6 flat
2x6 flat
See picture 6 and 7

Layer 6:
1x2 single stud
2x4 flat
2x6 flat
1x2 flat
See picture 7 and 8

Layer 0:
Flip over and add 3x differentials
See picture 9

See picture 1 to see completed chassis

Step 3: Build the Back Lights

1x right angle holder
1x semi-transparent blue light
1x semi-transparent red light
1x 1x2 police flat
See picture

Step 4: Build the Jet

6x flame
4x flame holder
1x jet enclosure
2x 1x2x3 with peg
2x 1x2 slope
See picture 1 for completed jet assembly

Put four of the flames into the flame holders like picture 2
Put the flames and holders into the jet housing like picture 3
Connect the pegs like picture 4
Connect the sloped pieces (picture 5)
Connect the last two flames (picture 6)

Step 5: Build the Skis

1x 2x2 flat
1x 1x2 flat
2x ski strut
1x camera
3x ski
1x 1x2 handle
2x megaphone
See picture 1 for completed assembly

Connect the 1x2 and 2x2 as in picture 2
Connect the ski struts (picture 3)
Connect the megaphones to two of the skis (picture 4)
Add skis and megaphones to the ski struts (picture 5)
Connect the third ski to the ski handle (picture 6)
connect the third ski to the ski struts (picture 7)
connect the camera (picture 1)

Step 6: Connect the Skis to the Jet Assembly

Step 7: Build the Instrument Housing

1x housing
1x temperature gauge
1x speed gauge
2x red round light
2x blue round light
2x red square light
2x silver grate
See picture.

Step 8: Build the Wings

2x wings
1x map
See picture 2
2x semi-transparent blue cylinder
1x mounting rack
See picture 3
See picture 1 for completed assembly.

Step 9: Build the Plow

2x plow
2x plow harness
See picture 2

1x 1x6 flat
2x 1x1 flat
2x 1x2 flat
See picture 3

2x 2x2 flat
1x 1x2 handle
1x 1x1 grip
See picture 4

See picture 1 or 4 to see completed assembly

Step 10: Put It All Together

Picture 1: Chassis and back lights
Picture 2: added instrument housing
Picture 3: added jet and skis
Picture 4: added wings
Picture 5: added plow
Picture 6: Completed to this point