Hi Gregory, I may be able to help you with this. I have a copy of the original publication and plans. My dad bought me the copy when it was published and I finally built one back in the late 70's. my model , with twin screws was nicked when I moved to Birmingham back in the Late 80's. The plans have yellowed somewhat and are a little worse for wear but I'm sure it can be scanned and stitched together using adobe photoshop. If you send your contact details to my email address – [email protected] I'll send you a copy of the plans and the article – which has a few photo's of the original vessel.
best Tom H