Why the kit obsession?
Isn't Level 3 supposed to be your chance to do what you want, prove that you have it all together (aerodynamics, construction, electronics, etc) and then put a big motor under it?
I don't universally endorse my way of doing things b/c not everyone likes to do stuff the hard way ;-) My L1/L2 rocket was scratch built. Maybe L3s should be scratch built? That concept is under consideration by our national organisation.
My 13 year old daughter started out with a Loc/Precision Lil Nuke, added about three feet of tube between the nose cone and the original body, built a baffle/anti zipper coupler and then, when Aerotech failed to deliver the 29mm goods, grafted a screw-on 38mm motor tube on the bottom (using a 29mm Aeropak retainer) and added 4 oz of lead to the nose.
I helped a bit with the engineering... but just a bit. Mostly b/c I wanted to convert it to a 29mm RATT afterwards and I wanted to be sure she didn't convert it permanently to 38mm ;-)
But it was her Level 1 so you have to start somewhere ;-)
See pic
I suspect that it will be her last kit (aside from an Aerocon FlippiFin)