I need some framework in my mind about building a cage so I can think about it. I guess the standard is DOM tube,.120 wall, 1.75 OD. Would this be used throughout? How about the front hoop? The Price of CrMo might be prohibitive, but can the OD of the tube be reduced for similar strength? This might be of particular interest in the front hoop because I have limited space in my 2a. The hoops, 3? one front, one middle and one rear? When looking at my random roll bar from whenever, the top bend is not 90*, its more like 80* . It might look nicer if it tapered at an angle toward the top and increase the rigidity of the structure because it triangulates a bit? I am not building a jungle gym, but want something I can count on to work as designed. Front hoop and sight. On a 2a there is plenty of times I have to either look over the top of the windshield or turn my head sideways to look out the front window to see stop lights. What have some of you done to make sure your sight lines are not completely obstructed by the front hoop. I have already gotten rid of my underseat tank and sunk my seat a bit to help this. 1.5 OD CrMo tube? What about hitting your head on a cage? How do you mitigate that? Short of making everyone wear 5 point harnesses with HANS devices, how best to design one to limit head impacts. Seat cradles. I really hate high back bucket seats in 2a's, but low back seats do nothing for safety. Would it make a lick of difference to build a cradle for the seats attached to the cage and use low back ones with a stock style rear seat? Would using a stock style seat completely negate the reason for building a cage? I need a back seat for kids, so what is a nice way of designing a cage to protect the passengers? Tying in the frame. If I build a cage, I plan on tying it into the frame. I would weld outriggers to the fame to the cage attachment points. Should I cut a hole through the tub and bolt directly to the outrigger or use poly isolators, or sandwich the tub floor. I can think of a strange but possible scenario where the tub and frame could separate, but not the cage. This could also cause problem if a seat cradle was not attached to the cage. I am not building a race car, don't plan on doing ROCK CRAWLING!, and am looking at this for safety if someone were to run into me on the street or a roll over on a trail. If I do build it though, I want it to be able to withstand whatever emergency its called for while not being heavy, obtrusive or a PITA. There is a lot to answer and talk about in this post. I have a lot to learn and others will hopefully benefit too.