The following are some pics of the fuel line routing I used, from the rear showing the filter and return line, then going along the outside of the frame rail, up to the junction of several unit body pieces, and then out into the engine compartment. I initially used two pieces of stainless braided teflon line, apparently it couldn't take the high pressure, as it almost immediately developed a pinhole leak.
I think if you were clever, you could use hard line with unions approximately where the flex joins the long run along the frame rail.
The last pic is on another car, showing approximately where the engine compartment hole should be.
The routing goes into box sections that make up the frame structure of the car, not into the passenger compartment, and the small exposed portion in the fenderwell could be easily covered with a sheetmetal cover.
