I bought 2 4x10 12 guage sheets. It turns out that they were 3/4'' long on each side so I cut 3/4'' off with my grinder. Burned through about 8 blades.
The tank didn't fit flat because of the bottom drain plug so I had to build a frame to raise it up a bit.
Then the perfect storm hit.
As I left the shop that night I made sure to drag it along the loading dock on my way out.
Woke up early and found some grease at a local restaurant to fill the tank .
Hooked up all the grease and coolant lines and insulated them for the cool weather .
Bam! done for now, at least running on grease again but there still is a lot of work to be done on the truck.