rangeroad and alibaba both have 2-3k dollar lumber mills.
bicycle wheels are the best place to start if you want to make a diy bandsaw. i’ve been told the easiest way to build your own bandsaw is to start by buying the blade then all the pieces.
fully automatic version.
https://www.youtube.com/watch?v=xNWUhZMmmnk
one of these with some kinda winch or stepper motor pulling on the chainsaw with maybe a spring or tensioner detector.
log grapplers are also nice to have. have seen them for backs of pickups even.
