@BulldogLowell
Thanks for your answer!
The first tubes I've seen are 2mm thin, and it seems quite a lot to me... I'll search more for it, but not sure to find affordable place to buy just a small piece of aluminium!
I actually didn't think about wood, but now you say it, it seems awesome! I'll definitely give it a try (even if that is probably gonna take a while as I won't be home for the next couple of weeks), and will let you know! 
Hi,
I've been successfully using MySensors serial gateway with several nodes (temp and humidity only so far), but woud like to bring a bit of design to these modules.
I quite like the way the Netatmo modules are finished. They would be perfect for a modern interior with the aluminium case, and I wanted to replicate them, using my already built sensors, adding a MQ-135 air quality sensor, and using an aluminium pipe as a shell.
My question is : wouldn't that case work as a Faraday cage for the wireless connection?
What would be the right things to think about during design phase? I would say :
When I see the Netatmo or all the new brushed aluminium laptops, I'm pretty sure the impact would be limited, but maybe the material used is different than simple aluminium? Or does the way the antenna is installed inside the case will change that?
Of course, best way would be to try, but I was thinking to use your experience before buying aluminium tubes!
Thanks
@axillent "There are modern LDO's who consume just a few uA"
Do you have any reference in mind?
Thanks