Are you sure it's from a '42? That's a rare car...I'd hate to see a hard-to-find piece like that butchered to fit a truck cab, when there's probably 100's of '42-'47 truck hoods available with just a little hunting...
Well, I hope you're not over 5' tall, 'cause there isn't alot of room inside a Model A to start out with, and with a chop, channel, and section, you'll never be able to get in it!
There was a discussion going on over at the Tri-Five Chevy forum about doing this...in the thread about a 4-door to 2-door conversion, a couple of the guy's said they were thinking about trying it!
Apparently, someone already did!
It looks like the bottom of the doors and cab have been cut off?...(poor-boy section)...I would probably chop it a couple inches to bring the roof back into proportion with the cab...
Rat rods aren't traditional, but the car in that pic is...a traditional salt flats roadster...
...in the late '40's, there was a California car club called, "Rodents", that were very active on the salt, that could be one of their cars...