Thanks so much guys for the pics. I was able to use those to wrap my mind around how to transition from that curve in the rocker panel to the straight cowl brace. I was able to cobble together a half decent looking panel that fits the floor brace as well as everything around it. here's a pic.
Jim, you were right. Banged it out tonight
Off to the city tomorrow for my cab braces and a drivers floor pan. Gonna show my buddy Chris how parts shopping is supposed to be done... Commuting in a slammed '48 Chevy!