I dunno why the cracks wouldn't be repairable -- another long chunk of steel on the inside of the frame, nice clean welds and some flat black paint does wonders! Depends if the rest of the frame is just going to kick out anyway though :(
Good luck! I know I couldn't find another used truck I liked for even twice the money I spent on fixing this one up. And I constantly
get looks and comments, especially when I'm all dressed up for work in a skirt and high heels!