Built from plans by Excelsiorrocketry.com useing 2 Baby Bertha kits, 3 18" BT-5 tubes and 6 BNC-5 cones plus one extra BNC-60 cone to be used on the lower section to protect against ejection gases. Total investment: approx. $45.00 making it a very expensive kit bash but worth it for the looks I get at the field. Always a head turner.