It doesn't sound as if you are that experienced in mains wiring from your previous replies, if so, please be very careful and ask for advice. Be safe.
I'm actually less experienced than it sounds. I'll be careful. The best thing I got going for me is that mains freaks me out.
Thanks for all your help.
That's a useful defense mechanism in keeping you safe. Your best bet would be to properly mount it in a metal case. For the mains input it would be best to use an IEC connector to avoid the trip hazard of a trailing mains lead when carrying. The Input ground pin should be wired directly to the case, ensuring good connection with a tag, serrated washers and lock nuts. The protective ground wire from the transformer and the ground from the Output socket should go to the same point.
The Input Live connection should go straight to a panel mounted fuse holder, sleeve all connections. Try a 3.15A Slow blow fuse to cope with input surge current. You may want to add a double pole switch and neon indicator, of just go straight to the transformer primaries, wired as the diagram. You could either use soldered connections with plenty of heatshrink sleeving or a mains rated terminal block.
The secondary wiring is the critical part for a safety isolating transformer - if either of the output connections accidentally comes into contact with the case (ground), it will completely nullify the purpose of the transformer. Wire the secondaries in parallel (0-0, 115-115, assuming your mains is 110-115V), straight to the output connector. If you need to extend the wires then use
multiple layers of heatshrink sleeving on the joints, or use a terminal block with an additional layer of insulating sheet, with decent overlap, underneath it.
It sounds as if you got a very good deal if you went back for the other transformers. They look useful and clearly marked. Make sure you parallel the primaries again for proper operation.
If unsure of anything, post photos as you go.