It's easy to upgrade a Rhino to a Space Marine Whirlwind.

FILES 

Just one file, containing Whirlwind launcher and a bulldozer blade. Do a Rhino first.
As always print the file exactly 27,0 cm high and 19,0 cm width.
whirl1.gif, Whirlwind upgrade part 1 of 1

INSTRUCTIONS 

N/A