There's tons of plans already out there on the internet to copy. I've even seen them with complete materials lists and how to's. Just Google Automotive frame table.
I've seen lots of 'em -- and it appears to me that you're planning on building a tank on it with all the material you're putting into the table. Not trying to flame you here - just sayin' I think you're way overbuilding it and all the extra stuff is just going to get in your way. Keep it simple. With three down legs per side it will be plenty rigid. I agree with Donny -- I'd do .250 wall tubing.
You don't have to keep this within .0001" === cars ride on springs - and the suspension is adjustable... bodies have bushings and shims... plus or minus 1/32" is probably plenty close enough... I'd be more concerned about how parallel the rails are because you'll be pulling measurements off these the length of the car and parallel would be a good thing!
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