It might not look like a Maslow yet…but it will. The top header is a perfect 12’. Now for a few cuts here and there and some bolts and a possible tack weld or two and it should start to come together into a frame that won’t flex or warp So far cost = 0 ….unless you count neighbors kids being upset that their swing set is missing.
good luck, I hate working with round tube/pipe. buy a piece of angle, it will let you keep a straight line along the side of the tube. Nothing worse than rotational errors.