My recommendation if you are going to build one of these is to have fun with the frame . . . because if you are trying to get it to replicate how it would be done in real life, you can go crazy . . . the idea is to make it look as if it would work, that's all. Or at least, hey, that's Cranky's attitude.
Besides I am really convince that weather you are building a rat rod, junker, beater, daily driver, or even a hot rod, all you are doing is painting on a canvas . . . real versions of these cars are for viewing more than they are for driving . . .
It's like with motorcycles . . . who would really ride more than 50 miles on one of those crazy customs or choppers . . . if you are going to ride (I guess this says more about my age) you want to ride in comfort and not so much style.