Cost effective? Not unless you are shooting thousands of rounds yearly.
You mentioned every component except the HULL. And it is a very important part of the recipe. Hulls vary in capacity and can create a dangerous situation very quickly.
While I am certain there are numerous shotshell reloaders here, you will be better served to check out www.shotgunworld.com
and inquire there. Nice bunch of guys and a ton of information.
Not saying you are irresponsible in any way, but some folks have the impression that shotshell reloading is just cramming a bunch of stuff into a plastic hull and shooting them. The fact is that you can destroy a shotgun quickly with poor reloads. Do your appropriate research and go about it cautiously. Always use known, PUBLISHED, and exact recipes. And have fun!
Hope that helps a bit.