Thanks to all for their input. I appreciate MetalMan's experience. I'm not doing the cowls, only the rear corners. I think I'll be OK with regard to the doors, as I am not removing anything structural. Please tell me if you disagree.

Brian, I saw your earlier post referring to the 2x4 dolly. Could you please repost the dimensions or describe its assembly? Thanks in advance.

What are others experience laying the cab flat on the firewall to reach the rear corners on the underside of the cab?