You have everything you need but spokes and rims. Regularly check the local CL, OfferUp, FB market, etc for 6 speed wheel sets. If the eyelets aren’t too rusty, the brake tracks look “good”, and they are pretty true, you have found your rims. A few days of liquid wrench at the spoke-nipple interface and you might be able to use the spokes.
__________________
I don't do: disks, tubeless, e-shifting, or bead head nymphs.