Slide works and everything!
Chain ladder up one side of swing set, just for variety
Chain ladder is attached by welding on a piece of bent 1/4" rebar, flattened on the ends by pounding against an anvil.
Swing seats were made from 1 1/2" hardwood left over from building the house stairs, a 1" radius cut on the outside corners, and rounded off top and bottom with a 1/8" roundoff router bit
Chains are attached to seats with 1/4" threaded rod, bent to shape and welded at the top as it was too brittle to make the sharp bend. Carabiners were purchased at a local hardware store.
Nuts were welded in place to hold wooden seats on the stirrups. Can't afford a failure in use here.
Swing chains were attached same as the chain ladder
Slide slips over a crossbar of the swing frame. Ends are capped with rubber feet available off the shelf.
Bottom crossmembers used square instead of round tubing to spread the load better. Ends were capped with rubber feet available off the shelf. Also welded on tiedown lugs from the local hardware store.
To make it slippery I sanded the slide with 1000, 1200, and 1500 grit wet-or-dry sandpaper, then polished with two coats of fiberglass mold release wax. It's really slippery.