I was thinking that instead of having just rituals which are soley magic I could add constructions. Just as they can forge weapons they can now forge all sorts of other things. Low level constructions would be small grenades. I know it sounds like im overpowering them but think about it. They will need to pay a fair amount of money for the blueprint, the mold, the materials, etc. and of course it takes 10 minutes or so to put it together. It's basically like using a ritual only instead of some other effect, they get a grenade. This first thread will be asking about how it could work why it won't and general feed back. If the response is good I may add a second post later asking for ideas of constructions. I'm a little worried that it could make the game to sci-fi
I like the idea. (it could give non-magical character access to ritual casting)
how it could work? like rituals I guess ... a feat (or class feature) to be able to use it, and 'blue prints' just like there are rituals.
I even think I got an idea for a first level one: Smithing: create a non-magical item (gives the players the craft skill back ...)
This sounds very much like the Alchemy rules from Adventurer's Vault, you should look at those. They might be doing just what you are looking for already 
Oh, also check out Martial Practices (currenlty only for D&DI subscribers) ...