Good luck getting your wife into little toy airplanes. If you give it any thought you are only in the air a little bit of the time you are at the field, the rest of the time you are hanging with other guys talking about it or watching someone else fly. Not a lot going on for a wife.
Fuel tanks, yes it is one of the critical parts of the plane. Do you really want some little kid in China assembling it for you?? It's bad enough finding all those little places they forgot to add some glue to the air frame but the covering hides that well enough. The 20 minutes it takes to assemble your tank is time well spent and buying an after market tank insures you that you even got a bung that fits the hole and isn't going to fall out then flood your air frame with nasty fuel leaving behind and nice oil soaked balsa wood compartment.
Just something to think about.