2wd hybrid bike

Has anyone tried running an in frame gas motor and a front wheel electric motor? I have been curious about this, almost to the point of ordering a motor to see how it would work. 2wd sounds fun. What are the potential pitfalls to this notion, besides weight obviously.
 
yes they have some one here finished a felt MP with this setup a front e hub and a 49cc 4 stroke hueshang kit
 
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