the best way to lay out all the building for the the farm yard
how do you want the cattle flow to be vs how are they setup? some barns here that got converted to parlor put the parlor at an end, use the length as the staging area.
others come in on the side, the other end of the barn is used as maternity/sick bay.
others built the parlor on the side of the old barn then the old barn became sick/maternity area and also calf area.
I want the cattle flow to be so that they come in to the barn from the main pasture at night and then after night milking then go into a night pasture close to the barn but the old set up are so the cows are in the barn over night.
and it I couldn't convert tie up to free stall I was going to make it like the parlor my grandfather had where the cows were in a tie stall barn and the the cows come in from the side
100% if starting from scratch I would not use a tie stall. free stall or loafing shed with feeding lane. I liked the local loafing sheds that you had a similar building but lot less concrete and steel. meaning a lot less money, the whole loafing area was a thick sand base that got bedding on it. we are 6 months of no pasture. so the loafing shed was also the manure pack for the winter. we have 6 months of no pasture.
but you have to work within your budget and start somewhere.