Steps :
> place the box ,go to function mode adjust size
>now place pipe cutpie ,do similar
On the function bar ,"scale" allow you to make size adjusts
For Eg you want to make the object tall ,
you have to scale in Y direction so click XZ to deselect these changes
now scroll the roller to make Tall /short as you need
Attaching objects is little tricky , just rotate grid pull object again do the same till they merge.
The pie object has made the rounded corners !
Make a vertical design and later use Shear /Rotate Object to make it slanted
On the left bottom the lightOptions button allows you to add super cool light effects