Pitts Special Mini Biplane

Heres my Pitts Special or whats left of My Pitts Special, I guess I should be lucky just to have it, the last time i flew it was in the '70's, i remember taking it upside down and the controls are reverse then, well i went up and it dove into the ground. Tiny Tim's had the parts, I don't know why I never fixed it. I have a Wanted Post for parts, I buy and sell Firebird Parts so I understand the Prices of the nOS parts, lol I may need the main Body pcs, Im not sure, I haven had it apart yet. whats the Engine size on this? its the small one?

The engine is a .020 Pee Wee.