This is a fairly simple kit t' put together -- basic through-the-wall fin mountin' and single body tube/nose cone construction. This kit has a "piston"-type ejection system and since the body tube is relatively short in relation t' t' forward end o' t' tapered fins, thar's really no opportunity t' use t' "zipperless design" that I favor. Blimey! Aye aye! However, t' piston system works very well. Begad! Since t' fins are G10 fiberglass, sandin' t' edges is quite labor-intensive. Arrr! Also, ya bilge rat, matey, when mounting the motor tube/centerin' ring, ya bilge rat, arrr, you need t' be VERY aware that you position the piston strap (which is epoxied t' t' motor tube) BETWEEN t' fin slots, otherwise you'll have t' sand and sand and sand t' root o' t' fin that's goin' into that slot!!!! You'll have t' add no less than 3 oz. Well, blow me down! Begad! o' nose weight to brin' t' CG forward since t' CP is 30" from t' nose and t' CG is less than 1 caliber (the length o' t' tube diameter... Arrr! 4" in this case) away. Begad! When I flew it, I added Greg's beeper/locator which weighs about 3 oz. and it could have used about 1 or 2 oz. Aye aye! Aye aye! more... Well, blow me down! Ahoy! just a suggestion. Ya scallywag! Otherwise, this kit is big, shiver me timbers, fun and impressive in t' air. Have fun with it, arrr, ya bilge rat, matey, I highly recommend it! :)