As I am no expert with elliptical wings are calculation, I approximated the total area as somewhere between 414 to 475 square inches.
I also looked carefully at the the instruction booklet and noted many interesting facts about this model.
- It has no landing gear by design. Nope, none, no reinforcement, no material provided, nothing. Hand lunch it is.
- The wing is sheeted and I have to cut the 10-inch ailerons by sight, with a ruler.
- The motor mounting is straight forward; a box mounted on the firewall.
- The battery installation is also easy, should fit a 4 cells no problem.
- The removal of the battery will require the removal of the fuselage.

There are no access hatch provided and the battery is mounted in a box that forms part of the fuselage structure.
- The stab and elevator will be built-up.
- The fin/rudder could be fixed, no rudder servo, no linkage, simple.
@Frank v B question for you: To rudder or not to rudder?
- The fin is three parts as per the instructions: centre piece of 1/32 plywood between 2 pieces 1/8 of balsa, sanded to shape. Heavy!
- The instructions even suggest that it could be a PSS. It is light enough, but no hills or ocean cliff nearby.
- For the covering, the manufacturer suggests dope and tissue. That must be an old kit...
You will see in the attached picture the intended increase in the stab/elevator and rudder/fin. The rudder may be a little bit to high and will probably reduce the height by 1/2 to 3/4 inch.