Want Advise For Making 12 Ft Dish At Home

I'm going to plan/construct a dish with following parameters.

Dia of dish = 400cm
focul length = 152cm
f/D ratio = 0.38
Depth of dish = 65.7cm ~ 66cm



In this options which can I use as main rib ( ? It sounds like that, I won't sure)

Flat iron or stainless steel or aluminium ?

Which is effective for easiness of work (main point is bending), welding, wind load resistant & economy ?

And pls help me out to make it...


I need valuable feedback....