I let you make them, and then approve them and add them to my ever-growing list of devices to choose from. I'll be available for contact here and via e-mail if you need any help, and if you're truly pressed for time I can do this part for you if you can give me a general idea of what you want each device to do.
The rules are pretty simple. I'm attaching a rough spell effects classification chart - it lists various basic spell effects, and rates them according to the Wizard's, the Cleric's, and the Technologist's ability to manifest that particular effect. For instance, if an effect has a 2 for Technologists, a 1 for Clerics, and a 3 for Wizards and you have a Wizard spell in mind you want to use as the base of the device's effect, you would increase the "spell level" by 1 to make up for a technologist's slightly-reduced ability in that area. If it had been a cleric spell, you would have instead reduced the spell level by 1 for this purpose. Zeroes are a special case: they represent minus 3 levels, basically things that that character class just can't do (Wizards and healing spells, for instance).
Once you have a phantom spell level, price it as below, and see what type of device selection will be required:
1st level - 5 (gadget)
2nd level - 10 (gadget)
3rd level - 15 (gadget)
4th level - 15 (technology)
5th level - 30 (technology)
6th level - 45 (technology)
7th level - 45 (artifact)
8th level - 90 (artifact)
9th level - 135 (artifact)
The numbers up there, from 5 to 135, are the costs for activating an instantaneous effect at that level. If it instead has a duration, divide that number by 5 to find the per-time unit cost. Technologist devices do not have per-level durations - they have a time unit (1 round, 1 minute, 10 minutes, 1 hour) and must be paid for as a swift action to keep them going.
Upgrades are like metamagic feats from the PHB/SRD - gadgeteer upgrades are +1 levels, technologist upgrades +2 levels, and artificer upgrades +3 levels.
Whew. That's the, uh, short version.
