You could use MDF panelling resembling tonge and groove for three quarters of the height adding a picture rail on top. However this may mean removing skirting and architraves or there may be enough room to butt up to them. This could be painted then you only have to be concerned with a small area at the top.

yes. stallion looks like it is in a sample hanger with all or most of the various colours available. your other photo with the 6 or so swatches looks like all warwick samples. The Bleecker pleat does look interesting. I haven't seen it in Australia. Just remember any 'different' headings will substantially increase your making cost. Making cost is usually not unreasonable in Australia in my opinion as we have regulated wages etc. so making will change depending on how much labour will be involved. the most 'flexible' cost with curtains is your fabric as fabric cost can have a very wide range as you have no doubt discovered. but the making cost is the same whether the fabric cost $25 per metre or $250. the labour is the same.

Thanks ! lovely but would cost a small fortune for a large room.

Loving the vanity and the tapeware. I’d probably use white tiles throughout, but have included one insp pic with a blue tile.