Roll Cage question

[almcbri]

Some of you may have read my post over at PT awhile back about trying to make these older cars safer. I am really considering going with a cage, but I want something that can still be back seat accessible and not over the top. I was told that if I guy used 4-5 point harnesses a roll bar is a must for a place the ancor the seats. I am going to use the Corbeau A4 seats and a 4 point harness if I find the right roll cage. Pics would be great so I can get a better idea of how to build this thing. I appreciate any help. Thanks, Andrew

EDIT: I like the way the mule bar is, but it still looks kinda tough to get back there.