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. However, t' piston system works very well. Ya scallywag! Since t' fins are G10 fiberglass, me bucko, sandin' t' edges is quite labor-intensive. Ahoy! Also, when mounting the motor tube/centerin' ring, 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. Avast! Aye aye! 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... 4" in this case) away. Avast! Begad! When I flew it, me bucko, ya bilge rat, I added Greg's beeper/locator which weighs about 3 oz. and it could have used about 1 or 2 oz. Avast, me bucko, me proud beauty! more... Arrr! Blimey! just a suggestion. Otherwise, this kit is big, fun and impressive in t' air. Avast! Arrr! Have fun with it, I highly recommend it! :)