Since this was my first attempt at using Radiant I thought it would be appropriate to show the process.
     

 The first brush. Ooooooooo!
 

 The first end platforms.
     

 The main bridge is complete.
 

 Let there be lava!
     

 Let there be platforms!
 

 Then the jump pads.
     

 Some models and weapons.
 

 Textures, a major pain in the ass!
     

 Specular lighting. Mmmm colors....
 

 All done. Frag, rinse, repeat!!