5 god pantheon based loosely on elements

[Gilladian]

You can see what I've written up, here: http://vishteercampaign.pbworks.com/w/page/103042861/Radotha%3A%20A%20Short%20Campaign

It isn't really very much, though there is a link back to the larger campaign world. I probably won't run this game for a year or more, as we're in the middle of an alternate game right now, and then I've pledged to finish our ongoing 5e campaign. I hope we'll swap back and forth with our current two games (I get to PLAY in one of them!) for most of 2016 before we wrap up. In the meantime, I'll keep building details and start outlining adventure sites and potential plots (mostly in the style of Dungeonworld - fronts and the people who are behind them, not really plotted adventures).

Right now, I'm thinking about magic and technology. I want to have magic be elementally driven, as well. For example, all potions are actually bottled elemental spirits, who on being released from their captivity, must fulfill an action before being free (so they will heal wounds, levitate a person, bend light waves, etc...). I want tech level at about early renaissance - simple firearms - but all magically created, not using gunpowder, etc... I'm thinking they have very crude steam engines, and other machinery, powered by mephits and such.

I'm wondering how to handle magic items - I will be using the 3.5E DnD rules for this campaign, but using the E6 restrictions - (Epic 6th stops level advancement at 6th, and permits feats only after that, so spells top out at 3rd level, with a few rituals for 4th level effects permitted). This keeps magic fairly low-powered, but in this world it will be fairly ubiquitous. I wonder if ALL permanent magic items should be "inhabited" by an elemental? But that would get pretty tedious, if every single item had a personality and a voice.

And what about spells? Should I "reinterpret" spell effects to be caused by elementals? Some are fairly easy - a fireball is a fire elemental, but how is charm person an elemental effect? I suppose it could be that some sort of djinn-type spirit is the one actually doing the charming, and is bound by the spell to use his influence as the caster commands. Should I "elementalise" just clerical type magic, or wizard/sorcerer magic as well? I just don't know...