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We used large bamboo (4") for the hole forms. used medium size wash tubs for the base form, used mazzola oil drums for the inside form, mazzola oil to coat the forms, 1 bag of cement (1 to 4 mix) for 5 molds, wire inserted the cement, and about 1 hours worth of work for 5 molds. It is really pretty easy to do. We will put them in the water after about 10 days of curing.
Initial cost (5 reef domes):
wash tubs - 800 pesos
used drums - 500 pesos
bamboo - 20 pesos
cooking oil - 10 pesos
1 bag cement - 208 pesos
labor/transportation - 300 pesos
After production starts (5 reef domes):
labor/transportation - 300 pesos
cooking oil - 20 pesos
1 bag of cement - 208 pesos
So, all in all....pretty cheap to give back to the environment. I figure we'll make a couple hundred for starters.