I built this BT-60 based Nike Smoke when I found that Semroc was offerin' t' nose cone in this size.  This makes for a nice, portable sized version that can be flown on smaller fields that t' 3" PSII version cannot.  Nose cone is balsa, t' fins are basswood and proper scale.  This model needed about 5/8 oz o' ballast in t' nose t' be stable.