Mel,
I took a look inside the wing saddle and it does have the pieces. This is a scratch built job. He cut all the formers and runners himself so it isn't a perfect match to what you have but I believe it could be the same plans. My other thought was it might be a old Royal/Marukata plan set. They are out of business and I can't find anything current on them. I know they made a DO 335 kit but thats all I know. Hobby Barn down in Tuscon was thier distributor but the web site is gone so I don't know if they are out of business too.