That is a pretty good size barn. For the past 3 summers I have worked on a lot of pole barns, the largest was probably the one where the arena itself was 80x150' and it had a lean to off one side that was 25x80'. That was one big job, we had two scissor lifts, the skidsteer, and worked there for about 2 months. We also built a machine shed for a farmer who has a big operation, It was 150x60' and has lean to's on either end which are 30x60. And it is hard to believe that the whole barn is completly full of machinery, hardly any room to walk. My grandpa himself has over an acre of barns on his place (boards 75 horses) which is a big job to maintain. It is a big barn for only 4 acres but it includes 3 indoor riding arenas, as well as hay storage which can hold a rediculous amount of hay, oh and you cant forget the indoor manure barn. My grandpa has built onto his barn for the past 25 years so it didnt go up in one night. With your barn, good luck with your project, will be excited to see the finished product.:thumbsup: