Hey friend,
I want to be very straight forward here in the hope that it'll give you an additional perspective:
The scenario you're describing I'd describe as "make the life of my surrounding as easy as possible when I bite the bullet".
. That does not include making my system or even the home server easy to use or maintain. My interests don't matter in that case only what those people need and would want. In my case: my non tech savvy wife would want to get rid of a big desktop PC but would most likely struggle because I enjoyed using it.
This means:
- For all data there are encrypted files with passwords and/or instructions.
- For all things no one would want there is a "this is how you get rid of it most easily" guide, including "call an electrician for the following recabling to pull out the shellies.
- for the one thing not easily ripped out there is a maintenance guide and a replacement guide (a bus system monster" temporarily" installed due to good reasons).
To be clear: no non tech savvy person I know would want to use my (and I guess your) custom systems. Not one. They'd rather have a "this is the ebay description" or a "this is how you install windows".
Your legacy will find other ways to life on - it won't be your tools and toys though.