Roaster Technical drawings

[Axel]

Hello!

I'm searching for technical drawings that illustrate a Probate P25 or an equally sized roaster of a different brand.
most importantly the drum dimensions(length, width, and wall thickness).

any technical drawings(schematics, blueprints, specs) or just drum dimensions of similarly sized or larger roasters would be highly appreciated also.
burner positioning and design in relation to drum and associated components might be useful too...

or just whatever anyone thinks might be educational when building a small to medium sized commercial roaster.

Thanks!