I think the flat roof, when braced correctly, is much stronger. Just look at ANY desert car or trophy truck, flat roof. They spend anywhere from 100,000 to over 300,000 dollars on those class 1 and trophy trucks, so I'm going to just assume there is some engineering involved. On my frame, I used .095 wall dom for the 2 main tubes, and roof, and used .065 wall for all the bracing. As long as the tube is just seeing end to end compression load, I think 065 is plenty. take an empty beer can, and you can stand on it if your carful, and it won't crush, and i bet thats less than .01 wall aluminum.

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Maybe you should chug on over to mamby pamby land....

When done correctly is right, as I said most are not around here. Most have only 2 to 3 inches of head room and very little bracing or it is in the wrong place.

I was looking at somer of those frames the other day and I was surprised to see that most of the kinda look the same./ That tells me that they have came upon a design that works. Your frame looks like them also.

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It's amazing what you can accomplish when you don't care who gets the credit.-
Harry S. Truman

http://www.desertrides.com/ Another good place to study chassis design. I like the flat roofs because if done properly they give more clearance between the corners of the cage and your head.

John

here is a picture of my roof

my flip in wellsvill.flat roof very safe

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i used sprint car style cage just cuz its cool an they got 20 cars on a 3/8 mile dirt track each pushing over 700 horse and dont die too often WTF?

Sweet, I like it! I want to do almost exactly the same thing to mine. Gotta have more headroom. Do you have any pics looking down at the top? I'd like to see how your bars are tied together. Cool roof rack too!

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looks like you would have to roll pretty hard to crush that!

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Maybe you should chug on over to mamby pamby land....

The roof rack is for stihl chain saw (what you need to get unstuck in a real woods buggy) and for coolers and groceries and tents an stuff, also keeps the sun out off your soon to be bald spot, and it holds the dome light too