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DIY Design PWM Contoller for 3 HP 36VDC Motor

A friend of mine and myself want to build a couple of small electric utility vehicles to use for chores around my farm and his cabin. We are thinking of something along the lines of the eMule.  http://www.solarevolution.com/eMule/ 

We just bought 2 new 3HP 36VDC motors for a really great price off of eBay.  See pics.

I want to build some PWM controllers for these to help keep the price of the project down and because I like building things. I could use some help though on a few things.

How many amps should the controller be rated for? 100 amps? Larger?

Are there any designs out there for a DIYer like me?

Thanks.

Picture of DIY Design PWM Contoller for 3 HP 36VDC Motor
Motor1.jpg
Motor2.jpg