construction industry question: is it easy to get unpaid time off from a salary or 40hr/wk job?

I need to get some steady work under my belt in the construction engineering technician field or something related and theyre all fulltime jobs. Ive worked a lot of oddjobs and short term jobs my whole life and have always had a lot of freetime and value it a lot. for the past few years i have been committing a couple winter months at a time to a personal project of mine in the middle of nowhere. if i pick up a fulltime job how do i go about asking for a 3 or 6 or 12 weeks off each year to run off to the woods and maintain/improve my personal project?

i dont need it to be paid time off, im always hearing about PTO this and PTO that, why do i need to be paid on my time off? i just need time off, i already have money cuase youve been paying me for my time ON, what the heck???

with all this work balance life talk ive been hearing, are companies actually open to you taking more than two weeks off each year??? i imagine maybe they dont like it bucase you still get full benefits each year, but your not working same number of hours as the other employees who dont ask for extra time off.