Is it a good idea to diy the osr2 out of wood or metal?
Metal probably sounds better than wood cause you’re dealing with electronics that generate heat. The wood might insulate the unit and trap heat, idk. Honestly you’re better off asking the tempest community that makes the units more than asking here where its mostly about scripting.
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First things first: Welcome to the forum!
Possible sure, but some things to consider from the top of my head. You could probably get more experienced feedback from the tempest discord.
Temperature and Cooling
As lamp said, there’s the issue of (probably active) cooling, because the parts can get hot. Please make sure to have appropriately dimensioned cables and connectors as well, as - especially with additional pitcher, twist and valve servos at 5V - the original design is vastly under-dimensioned especially for longer sessions and can reach temperatures of over 100 °C. One problem: Servo cables are not changeable, since they are designed for short use and environments which allow for either good cooling or high temps.
Screws
I would also like to point out, that relatively small screws are used, which would make the use of inserts almost certainly necessary, especially if you can’t find wood screws with appropriate heads or their use would impair the function of the attached parts (e.g. not enough normal force or movement). The most critical ones would be for mounting of the servos, because there’s barely any material left between the hole and the servo body.
Strength
Another aspect to consider is the type(s) of wood, as some parts require a certain strength (wood is anisotropic as is of course 3D printed material but at different absolute values, so be intentional with what direction the fibers are aligned to) while moving parts should be as light as possible.
Humidity and Fluids
Lastly consider the appropriate surface finish because there will be fluids handled near and around it.
Conclusion
So if you want to use wood, the best option is imho a combination of different materials for different parts/areas. If you go through with it, I’m already looking forward to seeing the result 
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It’s only a good idea if you can actually do it. The original OSR was not designed for 3D printing, but instead for people with access to a local machine shop that could make the parts.
You don’t need to copy the design in any real detail if you decide to try. It’s fundamentally just two servos on the sides connected to a toy holder of some kind in the middle, with at least one support arm to keep the holder from pitching randomly forward or backward. Just make sure the servos are securely mounted, and that heat dissipation is considered, especially from the servos themselves. Making a toy holder that secures the toy in place reasonably well would probably be the most challenging part, though I could imagine something as simple as a short length of PVC pipe with some bits added to secure the sleeve being workable.
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