I have then settled for kunifer or copper-nickel pipe but using stainless steel fittings. The only part I can't find in stainless are the Tee pieces, but the brass ones will be good.
I bought a 3/16" tube bender from Ridgid tools - model 603. It cost a bit, but it is much easier and neater to bend tubes rather than using your knee or a cheap bender! I bought it from here
I have also bought marine grade stainless steel P-clips to fix them in position using rivnuts. Once I have run the brake lines, I will mark and drill for the rivnuts to fix the P-clips to.
I am keeping the brake line as far away from the engine as possible to minimise the effect of heat. I may install a heat shield, but will assess once the engine is in.
I will hopefully finish the front pipe tomorrow morning, then move onto the middle and rear.