Phil,
I see that this is your first post, so welcome to the forum...you'll find it a vast resource of information and advise from hundreds of collective years of modeling experience.
Is this the plane you are looking for? Sorry, I don't have any plans, but here's an authentic photo, with the designed himself holding the plane. Must have been taken when he was still in the service.
I got this photo, an Atwood engine, and one of his speed trophies, all from Harold's estate when he passed away. He was a member of a nearby RC club in Florida, and was a joy to talk to....he sure had some memory for controline modeling history.
The gentleman that handled the modeling portion of Harold's estate sent a lot of plans to AMA headquarters/museum. They probably have not filed everything yet, but the original plans *just might* be there.
Good luck finding the plans.
Cheers,
Warren Wagner