Tumbler Drum Dimensions?

[mbopp]

So back when I had more time than money I made a tumbler that uses a 3# coffee can (6" dia X 7" long) as the drum. It runs about 60 RPM and does a fair job using lizard litter for grungy cases.
I'd like to try the SS wet pin method. But for 5# of media I'd like to know the inside dimensions of a 15# Thumler's B drum for reference to see if I'm in the ballpark for drum capacity.

 

[Otto]

A Model B drum has a 5 quart capacity.

 

[bluetopper]

I'd like to make a tumbler out of a 5 gallon bucket. Glue a couple of long thin strips of wood in the sides for more agitation. Rigging it all up is the problem.