How much paint for the inside of the cab

[rbruno68]

Looking for a little help on the amount of paint I need. I googled and search the forum for answers, but the majority of "how much paint do I need" was for painting the entire truck as well as painting the inside the same color as the outside. I want to paint the inside the original fawn color. I am not looking to get into painting trucks so I don't want to over buy if I can help it because this might be my only truck build. So, here is what I would like to do. I am having the inside, the firewall, and the underneath blasted. I would like to spray two coats of epoxy on all of those surfaces. Then, two coats of a primer/surfacer on the inside of the cab and maybe the firewall. Then two coats of the fawn on the inside of the cab and firewall.

I plan to do the Fawn and Cameo White in single stage paint. No clear.

I plan to reach out to TCP Global for the Fawn and the Cameo White to do the dash trim and steering column. I think I have seen others with each of these mixed in quarts. Is a quart enough of the Fawn to for two coats on the inside and firewall?

I am not sure I can find the epoxy and surfacer in quarts, but wanted to see how much people think I will need.
Rob