This rocket is classic Estes all the way. I have been building rockets since the age of 10 and I'm in my 60's. There are some comments about having to cut the slots for the fins. It's a challenge, but I enjoyed it. It's easy to push the rocket tube in when you are cutting the slots. Try this trick to help make the job easier. Assemble the motor mount tube first. Then slide it into the body with out gluing it. The rings on the motor mount will support the body tube while you're cutting the slots. It works very well. Also, don't try to cut the slots in one shot. Use several passes until the knife finally cuts through. And use a new, sharp, blade! Hope this helps. AJ ;)