If done correctly soldering brazing and welding are plenty strong for a roll cage.
Rc roll cage diy.
The bars shown in blue are optional.
Part 1 overview teardown.
New mini rc drift build converting a model car to rc.
Shown here is a visual difference between your basic 4 point roll cage and an 8 point roll cage from the chris alston s chassisworks catalog.
An 8 point roll cage includes a main hoop a windshield brace across the roof a back brace sides subframe struts and gussets.
If you go brass go with 3 16 tubing from msc.
Jadpes rc car model roll cage chassis frame black diy rc steel frame car roll cage tube metal body chassis frame for axial scx10ii ax90046 1 10 scale rc crawler car 5 out of 5 stars 1 80 53 80.
Here is video with strength test of brazed aluminum.
First you said you need plans and know what materials now you say you know how to build it but dont know what materials to use.
An 8 point roll cage is the most basic and therefore probably the best option if this is your first build.
Here is the video of me brazing an aluminum roll cage for my project of a trophy truck.
If you go steel get 3 16 brakeline.
Beyond this there are 10 12 and 14 point designs that provide more structural integrity.