So I've been looking at different designs for bumpers and I think I've decided what I'm going for. My question is about mounting it. How do I beef up the unibody mount points so that they will support the added weight and also be strong enough for recovery?

 

These are the plates I started my front bumper with. http://www.ironrockoffroad.com/10464.html

 

You could buy one of the many diy bumper kits that you weld up.It would save you some money and take all the guess work out of making your own bumper.

 

^ What he said ^ and there several to choose from with good design's.

 

+1 on diy bumper kit, plus you can somehow experiment with some stuff to make it more personalized.