I’m in the procces of aquiring parts/materials for a Primo to LR4 full sheet conversion that I plan to start in the comming school holidays. For others refference this is what I found for rail suppliers in OZ.
A 6m length of 304SS 31.75x1.6mm can be had from my local steel suplier (Edcon) for $64aud. they will cut to size if you ask ($3-4 per cut from memory). I haven’t got it yet but this is the path I will likely go.
They can also get 6.1m same size in gal for $41.
Just got off the phone to them. Turns out the Blacktown branch dosn’t stock the 304SS or the Gal but can have them next day if you order them in.
(No affiliation with Edcon just been using them for years and always found them supper helpful and well priced)