Okay, here are some updates.
The vaporizer design is pretty much set in my mind, so I've started to focus on the case design. I want the case to be equally important to the overall experience.
I went through many different variations, but this is what I've settled with for now...
Here is the link to the image for fullsize viewing, http://i.cubeupload.com/xAVpFB.jpg
I'll explain a little bit about what is going on here, because I know it appears confusing at first.
The case holds two wheels inside of it, one of the left side that holds charcoals, and one on the right that holds herbs. The right side of the case shows the two wheels which can be turned with your thumb. The wheels are turned to align the chambers with the two holes on the top of the case.
In the closed position, the steel lid is held on by a large magnet, and locked to the wooden side under a dovetail.
To load the vaporizer, the herb chamber is placed into the hole on the right side of the case, with the wheel turned to reveal the herb chamber you want to empty. The case is flipped upside down, and the herb chamber dispenses the herbs into the vaporizer. The wheel can then be turned to the closed position.
Only the steel lid is removable for cleaning. The charcoal dispenser wheel is permanently hidden within the wooden case. This is both for easier manufacture, and because the wheel won't have to be cleaned of sticky herb residue and powder. The steel lid can be removed, and the wheel cleaned if needed. Depending on how the prototype turns out, I may incorporate a felt gasket on the top of the herb wheel, both to protect against fine particles getting trapped between the wheel and the steel top plate, and to create a bit of resistance while turning the wheel. If I don't use a felt gasket, the top of the wheel will be waxed with beeswax and lapped perfectly flat for a near perfect union with the steel top plate.
The vaporizer itself is stored inside of the removable case which is held onto the side of the main case with magnets. This is also held together with a bar magnet, and tiny steel pin that will lock the lid from rotating.
The smaller case can hold a pre-loaded vaporizer (one chamber full, and one charcoal, good for a single one person session) for times when you don't want to carry the main case with you. Two button magnets will be supplied, they can be used to clip the smaller case onto fabrics or backpacks... You could stick it to the outside of your jeans, or shirt, or backpack, or whatever. The same can be done with the main case, if you want it stick it to the outside of your jean pocket or something like that.
Aesthetically, I am going for a minimal vibe here. The wood will be most likely beech, because it is quite stable over time, it's local, and has a very nice grain structure and aged appearance over time. The steel will have a flat lapped underside, but the top will have a traditional rusted finish, which will be waxed to seal the steel from further rusting. This finish has a long history of use in Japanese metalwork, and have a very natural feel to it. The steel will give the case some weight to it, which is a trade-off in portability, but I think it makes up for it in how it will feel in the hand.
Anyhow, I'd love to answer questions, and get some feedback!