About $60.00 in 1972 for all the materials and supplies to build the thing. It was not a cheap proposition back then.
Remember this model is over four feet long and eight inches in diameter at the widest point of the hull. It took alot of material to build this model, including the model aircraft dope for the covering of the frame, the silkspan covering paper, itself, and mostly for all the balsa wood I used in it. I saved alot of money on this project by using alot of department store gift boxes for the cardboard for making the concentric ring discs for making the basic shape of the hull, cut out in the center to slide on a 3/4" X 3/4" square stick axial keel.Otherwise if I would have had to pay for the cardboard to make the ring discs, the project would have ran over $100.00. The overall appearance of the big dirigible model is that it does look like the homemade project that it is, made by an 8th grader in junior high school. The hull is far from smooth and by what I can do today is quite "lumpy". but beings that this was my fourth attempt and scratch building a model of a large rigid airship, using only a small profile plan that I blew up by using graph paper, I do not think it came out half bad. that is why I still have and maintain the model today, yet.