Well, this is off to a bumpy start. I would recommend you rethink and revise your plans.
First off, the H210i does not "support thunderbolt". It has a USB-C (for USB 2.0/3.0/3.1G2/possibly 3.2G2x2) socket on its front I/O. That is not the same thing. For thunderbolt support you need a motherboard with Thunderbolt support (of which there are a few, but not many) and those only exist with rear TB3 ports. There is no such thing as front panel TB3 outside of a Mac Pro. The internal cabling connecting that front port to the socket would never ever support the data rates necessary for TB3.
Beyond that, plugging a MacBook into a TB3 port on another PC wouldn't charge it. Or, well, it technically might, but at 15W (as that's the power output spec for TB3 host ports), so the laptop would trickle charge at best, and still drain its battery under any kind of load. The only use for PC-to-PC TB3 connections is Thunderbolt Networking - which is brilliant, as it gives you "free" 10GbE between the connected PCs, but they won't charge. There are no motherboards with USB-PD output support through their TB3 ports.
Beyond that, as someone whose main rig lives in an H200i, this is not a small and travel friendly case. I chose it because it was the best option for my already owned ATX PSU and necessary water cooling at the time (outside of exorbitantly expensive options), but it is by no means compact for an ITX case. A pelican case big enough to house it plus the necessary padding to keep it safe (which, considering the weight of an assembled system like that would be substantial) would be
huge. You'd need to add at least 10cm to each dimension of the case, though 15 would be safer.
Something like a Cougar QBX would be a far better option for anything that gets moved around a lot.
@Choidebu I have multiple pelican(-style) cases that could undoubtedly fit inside my H200i if it was empty. They don't have wheels though
