So i tried the solvent, tried numerous ways of getting the screws out to no avail, the actual body was seized together, and regardless of how many times I tried, it wouldn't come undone, I even drilled the screws out and it still wouldn't open up. The previous owner left it out in the rain 24/7, brought it on camping trips, and never cleaned it. I wound up replacing the control valve from grillparts, and it's working great.
Thanks everyone for the help, it was a headache but this is one of the most rewarding experiences i've had. I will post pictures once I finish painting the newer head and get the wood slats stained!
Side question: I am looking for the push nut retainer for the weber emblem, but I forgot it at home. Does anyone know what size they are offhand?