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Here are some photos of a few of the cages we've built over the years.
This cage was for a VW Jetta that was built to race performance rally events. This cage had to meet the new (at the time) requirements with guessets, etc. I don't know if the car was ever raced or where it ended up, but if you have a helmet on and a race harness on, this is what you want around you if you crash!
I built this cage for a long wheel base Suzuki Samurai. The LWB was never sold in the US, and this guy imported his from Canada. Because replacement parts would be nearly impossible to get, he wanted extra protection for the sides. I built the fender protection such that it bolted to the rock sliders, the cage structure, and the bumpers. It was quite stout.
Here it is with all the side protection built and installed. Oh, and with the gigantic tires also installed.
The Merkur XR4Ti had about the longest alphabet soup name ever at its time. They were a dumbed-down European Ford Sierra XR4i and were great cars but for the underpowered engines. Note how, besides the cage tubes being placed as close as possible to the existing body, the cage is also welded to the body wherever possible to increase strength and limit how much the body can collapse in the eventual crash or rollover.
A quality cage build includes precisely mitered joints and solid chassis mount points.

This cage was for a drift car.
For strength and to reduce bending and shear loads, all tubes, when practical, should meet such that all their centerlines intersect.
A cage for an off-road Toyota truck.
