904 Transmission Stopped Going Into Gear

Forget about the end play for now. That was probably just because the large chunks of band material were stuck between the clutch packs or something.
For now, just identify how bad all the damage is. A&A Trans is one source you can check with on resurfacing the excessively worn hard parts, like that drum or even cost of replacement parts. If you have a good local supplier, like Transtar or something similar, you can check with them on cost of replacement parts.
End play can be set after everything else is figured out.