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[Fraser]

Tubing and flat steel for extra support under a UNIBODY
and for reinforcing rocker panels..

Also diameter and wall thickness for roll cage stock...

I have heard 1 3/4 inch diameter and .75 thickness on DOM is respectable.. ( was thinkin thicker ? )
just lookin into things for future reference ?

[BiGdAdDeE]

.75 thick
that's 3/4 of an inch!!!!
that's a little overkill
how about .20 for thickness or were you referring to the steel plating for the unibody?
cause 3/16 '' to 1/4'' works there

[Fraser]

ha ha rookie here .. still gathering info..
 but thanks

[Twisty]

For what you will be doing, you don't really need any extra bracing.  But if you can weld, and fabricate, it certainly won't hurt anything.  I'd go for .188" (3/16") for plating the unibody.  If you are new to fabricating, then skip the cage building project for now.  Its not totally necessary.  I doubt you will get yourself into a situation where you will REALLY need it.

And if you do build a cage, 1.75x.120 DOM is what most people use. 

[jps4jeep]

I'd go for .188" (3/16") for plating the unibody

I would do this first and formost. do it while teh body is still fairly straight and clean.

And if you do build a cage, 1.75x.120 DOM is what most people use.

this is what My cage is made of.

[HEYzipupyourfly]

if your dom is going to be made of 4130 you could get away with something like .080 wall. but assuming your going to be using a mild steel like 4340 i would stick with a little thicker wall than that, .100-.120 is a popular size, and 1.5" tube is plenty strong enough no need to deal with 1.75" in my own opinion