If you send me an e-mail ( [email protected] ) I can make you a preview, to show you what your rocket should look like with decals applied! I can custom fit them to exactly what you want!
If you just want to order them off the website, I suggest about 15% smaller than the rocket. that will fill up the visible area without it looking too big.
so a 2.6" tube, use about 2" to 2 1/4" , 4" go 2.5 to 3" etc!
Remember if you contact me directly I can add to, change modify etc any lettering to make it exactly what you are thinking about!