Hi Kenji,
I can't vouch for the driver support of such a motherboard, thats best left to others. I must say, that is a nice looking motherboard, and I for one would be most curious if you were to get it working.
Another alternative, that I am looking into with NUCs is perhaps a Xen server, again, better left to others to tell you the support, but at the risk of hijacking the thread (please fork it if you have info on Xen) if anyone has any information on Plan 9 and Xen, that would be most welcome too.
Good luck with the venture and your retirement, and interesting news to hear the atomic power facilities are curtailing in your part of the world. We should talk about this in future, privately.
Many thanks!
Shane.