Thanks Tony C. I appreciate the confirmation on skinning the wing. I was concerned about the contact cement eating the foam. I will try it on some scrap first. I am quite familiar with the operation of twin engine planes as last summer I was flying a twin 25 powered home design patterned after the Herr Aqua Star. A 1.5X increase in scale lets you use a Eagle 63 wing knock off. Some extra sheeting to stiffen it up and voila; It flew great.
The 60's I am planning on using are four strokes so I think an 8 oz. tank should be enough. If I can I will try to squeeze in 10 oz. tanks.
The engines will be inverted so I hope that dosen't lead to any trouble hauling the anticipated 16 to 17 lbs of plane. So far I am amazed at how well it is going.
Peter