An affordable barn made with two containers

String level pulled tight with the level in the middle of the string should work fine to get your outside measurements. Use good quality masons string that you can really pull tight. Once you have the two outside measurements then you can remove the level and just use the string to set any additional posts.
 
For you more resourceful fellas.. Say you had estimated 2' drop in elevation over the course of where you wanted to put a 40' container

1. How would you go about leveling support points for said container with just basic tools that might be in the household? I've thought about just using lathe/string line/string line level but I feel like there would likely be too much sag in the string line? Also heard that a lot of the cheaper lazer levels are basically worthless outdoors but if there is one that would be suitable for not crazy $ i could see buying it.
2. What would you use for foundation/support underneath it? Assuming i'm going to get it elevated and not build a gravel pad for it.

@birdog - I hadn't considered covering it although there is pretty good mature deciduous tree coverage over it. That sounds like another headache!
I used 3 1/2 inch concrete patio blocks to level mine. I also put down about 3 inches of the big course stone to allow for drainage and air circulation under the container per the shipping container guy. I leveled my pads using clear hose and a 5 gallon bucket filled with water and sprayer dye (you really don't need the dye but it makes it a lot easier to see your line). I zipped tied the clear tube to a 1x2 board and set the bucket of water on an upside down garbage can right smack in the middle of where the container was going to go. Stick the tube in the bucket and get some water in the tube and then use the water line in the clear tube to level your block. Set the stick on your highest block, or really any block for that matter and mark a line on the stick where the water line is and there you go. Set all your blocks to match that line and don't move the bucket or you will have to start over. It sounds like a lot of work but I already had everything set up to level platforms for tower blinds. Basically it's a poor mans transit. The video should help explain it. He uses a yard stick however I just made a mark on my stick. One stick that you can move around with is better than how this guy did it but I think you will get the idea.

And yes I agree. If you have good shade on your containers I think you will be fine. Direct sun is bad because them suckers get hot!

 
For shipping containers I highly recommend a 6”-8” or more air gap under the container for air flow. We have had them on the ground and after several years the floors rot we now set them on retired concrete railway crossing planks on each end under the bulkhead is all that is required and they will last for decades set this way.
 
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