It should be ideally possible to build up your OS from source code. I think this is can be possible, if the OS will be by default with minimal core packages (system level). More info:
Bootstrappability is a criteria for base distribution choice for Kicksecure.
Realistically, we’ll only get this feature if a base distribution gains that feature and we port to it.
There are no suitable, promising base distributions at time of writing with this feature and other criteria.
Added to Development Goals.
related:
Builds from Source Code versus Builds including Binary Packages
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