found this….
http://www.ebay.com/itm/PICA-SPITFIR...item1e853c6c8b
you might try hip pocket aeronautics repository of plans… I did a quick look and didn't see the Pica model, but they have close to 20 different spitfire plan sets in there for download….
I know neither is exactly what you asked for… just trying to point you in a couple directions, hope it helps.