I will be building on top of the bottom skins. Some prefer to build on top of the spar (bones vs. skins) first - I've done it both ways. I think for a model this size I like having the bottom sheeting in place. I cut the plans apart and used the wing plans as a template to build the bottom sheeting. I used 3/32" balsa sheet - a combination of 48" and 36" lengths and 4" and 6" widths which I had around the shop.
















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