Electric for large Planes

I plan to start a 1/4 scale Stearman (Boeing Kadet) this Fall or Winter.
 I 
intend to model the plane flown by Johnny Vasey in the 1949 National 
Acrobatic Champion****ps.  I will use the Barron plans for the basic
plane.

My question is the practicality of using electric power for this airplane.
 To 
make it even more complicated as I live at 9,750 feet (2972 meters) which 
requires significantly more power.

Is there a conversion formula for Electric Versus Gas?  How about
relative 
expense?  Certainly not having to clean up the plane after flights is a
plus, 
but a negative is the time to recharge batteries.

Any thoughts?

JakeInHartsel