I would like to build a 30 x 40 pole building. I have been trying to find a flat location to build on, but that doesn't seem to exist on my property where I would like the building. Recently I saw a pole building being constructed on a hillside and they set the poles on the hill so the tops were all even. In other words the poles on the lower sections were taller than the poles on the upper section. Then it looked like they bolted boards horizontally between the poles on the lower sections to create a wall. Then they filled dirt in the inside of the building making the floor level with the higher ground. I hope that makes sense. Seems like they were using the wood and backfill in place of concrete footings and a concrete wall. I am just wondering if anyone has used this method before and what your toughts about it are?

Thanks
Chris