Ductile cast iron where & how much

[bladehunter]

Need some cast iron to make a new saddle & slide for the lathe (don't ask). Oh yeah I'm in Sydney.

Finish size needs to be 120x39.5x150 & 85x21x210. Yep I know I'll need larger sizes to get to the finished sizes.

Is rect bar available or would be getting it from round stock be a better option ?

[Redmohawk]

Flowcast in Vic 0393506333 they're on the net and do rectangular stuff

[Hagarr]

3D printer?