1 Create a shader for each texture file.
2 Select the oven
right click and change to face selection then select only the faces you want to texture then planer map those faces only.
3 Only with those faces selected go to the hypershade and right click on the texture file you need and click on Assign Material to Selection.
Repeat steps 2 and 3 for the other faces and textures you need.
2 x Modeling Challenge Winner