I appreciate the input, this building will be solely for working on stuff ( I say stuff as being a mechanic of both automotive and diesel, I dabble in everything from AG tractors to trucks to trailers to cars and in between).
I recently lost my brother to cancer at the age of 46 and it has sparked a desire in me to no longer wait for what I want, because there's no sense in waiting only to never get to see it come to fruition or get to enjoy it.
I ballparked 30x50x12 originally as that was a steel prefab building I found at a severely discounted price, that being said my ideal would be 40x60x16.
As for concrete my best friends brother in law does concrete work locally, and there's a concrete plant 10 minutes from the house, Andreas gets cash deals with them all the time on leftovers and seconds.
My wife's cousin is a licensed plumber, and her uncle is a master engineer, my dad's a very skilled Carpenter and over the years I've done a lot of electrical work that's been checked and signed off good by the ESA, so overall we have the abilities.
A mezzanine and a bathroom/clean up room were already in my mind, I'm only going to install one hoist in the shop and want a clear span asymmetrical 12k unit.
The grand plan is a covered area off the one side to park my plow jeep and trailers.
Eventually I'll put up a secondary building just for the use of storing what we have. But we gotta walk before we run.
These are ideas I've had for nearly 2 decades and have been actively planning for the last decade, I just had to get the rest of life to work.