the Kokam 140mah cell would be a perfect replacement. its just a shade heavier than the stock 130, but they're cheap ($6.50). you can get them, and pretty much anything else related to micro RC, from this place: http://www.bsdmicrorc.com/products.cfm?catID=10001 they're good people to work with, very fast too.

thats cool that you built the plane with just 3 views. working with balsa is a good art to learn, it'll teach you patience if nothin else

this is one plane i've been wanting to do, pretty unique looking. i havent been able to track down any 3 views yet, but i havent been looking that hard. i'm sure there's one somewhere though.

nick