If you mean kit as in a laminate bow then no IMHO...saplings and proper chosen grain boards are best to learn on.
If your a cheap goat like me your best option is to go cut some whitewood saplings and learn on them for free..instead of payin money for materials that you'll possibly ruin in the end..and even if ya r successful it'll still be far from what it should be...99% of anyone trying there hand at bowmaking takes many tries,trials,and successful bows to be able to make a great bow....do your best but don't expect your firsts to be all that you hope it to be...good luck and don't give up
PS..a sapling (or any fresh green cut wood)can be flinging arras in a few weeks via quick dry method