It's a real shame you won't be at Hivefest. I'm sure the guys will use your experience to make it a great event. I'm not going either this time.
I've been through building a house. I didn't manage everything, but I was very involved. I did all the wiring and various other jobs. We had to deal with rain when it wasn't all finished, but it turned out well. It is nice to plan it out exactly as you need it. I didn't include a server room, but I did get my 'man cave'.
that's exactly what I was thinking, an IT/CRYPTO stufff office maybe under the roof, and a training room underground. the rest is normal, big kitchen, 2-3 bedroom, lounge and a secret room for kids and toy, going through the wardrobe. I know, a bit crazy. Do not start me of the garden.