From personal experience there is not as much room as you think there is between the frame brace......
I like the tips, bed exit, well its your truck and - as my good lady wife says " the reason there are blondes and brunettes is that it World would be a very dull place if we all liked the same thing...."
I am going single turbo (eventually) with a loud valve dumping out between the fender and the chassis with a full length single pipe for when off boost.
What I am trying to say is that you have options. Pick the one you like.
A for the chassis so far... That I really rather good. Well done sir!
Please continue.
P.