Melbourne

Thin flat batten for the top and for the bottom. About the same width and thinness of a wooden school ruler only long enough to extend a few centimetres wider than the fabric. Or lengths of thinnest possible plastic pipe. Bunnings can help you here.

Attach in a variety of ways :

1. Glue picture on to batten/pipe with fabric glue or flour & water (cooked) paste. If using flour & water paste, add a squirt of aerogard to the paste before using to deter insect attack.

2. Thin strips of neutral coloured fabric to make tabs for the top edge - also glued or stapled to the back of the picture fabric. Tabs should have a big enough loop to put the batten/pipe through at the top. Bottom batten as per 1. above.

3. Staple the fabric to the battens for both top and bottom. You'll need an industrial stapler - office staplers aren't strong enough. One staple every few centimetres. Can be tricky to get right so it doesn't wrinkle, but the least messy option. Doesn't work too well for pipe mount.

Then either tie some string to the ends of the top batten/pipe and hang from a hook, OR

Drill hole in each end of the top batten to tie the string to and hang from hook. OR

Run a piece of string through the pipe (if using) and tie ends together to make a loop and hang from hook.

You can put the hanging hook right up near the ceiling where it's less obvious and tie a loop of string from that and then tie that to the string on the picture, being careful to centre it so the picture hangs straight.

Lengths can be adjusted to suit. When you've got the placement right, replace the hanging loop and maybe the string on the top batten/pipe with brass picture wire cut to the length you want. Kits at Bunnings and Lincraft and probably Kmart.

The advantage of hanging a fabric picture on battens/pipe is that you can roll it up when you move. Then you only have to fix up the hole where the hanging hook was before inspection. And you can re-hang it in your new place without much difficulty.

Also Gibson will enjoy batting at the picture when it moves in the breezes. You can secure the bottom batten/pipe to the wall with a couple of discreet bits of blutack if you don't want that to happen.

a rail set

https://www.ebay.com.au/itm/182181882132?_skw=hanger&itmmeta=01JWJGACCQJFTP96VS6AS525BS

or buy some 1.5 cm dowelling. Sew a length of 5 cm wide scrim to the top and bottom of the hanging, then tack the scrim to the dowelling . Put a tack into each end of the top dowel and tie a ribbon to the tacks to hang it.

Rug hanger/tapestry hanger

Though these would make screw holes in the wall

I was gonna say build a frame for it but 2.3m x 1.8m is huge lol might be an effort.

Drawing pins

Clippy pants coat hanger?

Any backing on it?

Is it solid or will it sort of curl up into itself at the moment?