RE: How many squares would you say...
Perhaps a little more information would help.
The Grumman XF5 Skyrocket was an experimental design of the WWII era. It was intended for carrier operations and boasted two radial engines in a more or less conventional airframe.
Last Summer I scratched together a 'proof of concept' model I ended up calling the 'Hoot' because it was a hot little hummer that was a hoot to fly. It had a single TD .020 for power and carried about 90 square inches of wing. Since Hoot is quite fast I decided that my Skyrocket should have a little larger wing to carry the extra weight and for (hopefully) added stability if/when the engines quit not at the same time.