Thank you, very kind of you.
I will be playing with seL4 and ROS and Strix Halo - things I know very little about and interest me very much.
Custom Home Automation I would do if I had solar power i.e. inverters or something more important than water leak sensors (the rest is just for fun and Home Assistant all in one is more handy that way for me).
But I would love my own mail and xmpp server - maybe NextCloud but actually working - running on my local DMZ. Which reminds me I need to buy 4 port low watt mini pc. Retail for these in my country is horrific. Amazon.de it will be.