You could make an old looking skull from exhaust tubing and mount your shed to it.
Or you could make a skull from exhaust tubing, and a copy from exhaust tubing of the shed you found, and mount them both to the skull.
And I suppose you could even make a big horn sheep skull and horns.
Or you could make a skull from exhaust tubing, and a copy from exhaust tubing of the shed you found, and mount them both to the skull.
And I suppose you could even make a big horn sheep skull and horns.