Start with the motor mount which, by volume at least, is nearly the entire rocket. The motor hook goes on the outside of the body tube, and then the Tyvek piece gets glued over that. (It was gauze in the original K-15.)
I tried using yellow glue for that, but the Tyvek didn’t seem very impressed. After failing to get it to stick all along the edges I pulled the Tyvek off, wiped off the glue, and then tried it again using contact cement.
That held, but I didn’t clean up the excess before it dried, and now cleaning that up is going to be a pain.
The kit doesn’t include a thrust ring. I decided to add one above the hook.
The nose cone got an Elmer’s Glue coating.
Rich's Rockets 