2 motors 1 bike?

I currently have a 49cc kit on my beach cruiser and a friend has an e-bike he built. I'm a noob in the forums so I'm not sure where this goes. But me and this friend had the idea of getting two bike kits and mounting them both to a single bike. One on the front wheel and one on the back. Im leaving out what kind of bike to make the question a little more broad. I'm asking for thoughts such as...

Effectiveness,
Efficiency,
Complications of having both motors

I'm thinking it's possible to link the throttle to a dual brake lever to pull both throttle and clutch cables evenly. I feel it would also be difficult to keep the front drive chain with tension. I could weld a cage or frame like mount to place the front motor. What am I forgetting?
Sounds like a head ache
 
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