It can be as hard or harder to repair a bedraggled old building to the point where you'd be safe putting chickens in it as it would be to build a new one, so I can see where you're coming from.
What about this -- could you build run panels that could be set up off your garage for now (allowing you to put the chickens in the garage pen for the time being, and still let them have a reasonably secure run that you could plastic-over for winter). But then as time/finances/ambition permits in the future, if you ever *should* fix up the old milkhouse for chickens, you could just move the run panels and re-use them as a run over there?
Basically you would make the panels as large (like 5x8) rectangular frames with strong welded wire or hardwarecloth stapled or screwed onto them; then you would bolt the panels together at fenceposts that you sunk into the ground. Obviously the fenceposts would be the harder part to move
but at least the main part of the run - and the main expense of it - could be relocated if you ever got the milkhouse going.
Just an idea,
Pat
What about this -- could you build run panels that could be set up off your garage for now (allowing you to put the chickens in the garage pen for the time being, and still let them have a reasonably secure run that you could plastic-over for winter). But then as time/finances/ambition permits in the future, if you ever *should* fix up the old milkhouse for chickens, you could just move the run panels and re-use them as a run over there?
Basically you would make the panels as large (like 5x8) rectangular frames with strong welded wire or hardwarecloth stapled or screwed onto them; then you would bolt the panels together at fenceposts that you sunk into the ground. Obviously the fenceposts would be the harder part to move

Just an idea,
Pat