Dont know if this has been posted but here you are.
When you do the mod with 12 inch fire basket, 3 inches from the bottom of expanded metal put the charcoal grate. That way you can flip the basket and hang it on u bolts on the top of your drum to use it as a grill.
You then buy this 22.5 inch cast iron grate to get the good sear marks. Pricey for what it is, but a good solution.
Amazon.com: Cast Iron Grate, Pre Seasoned, Non Stick Cooking Surface, Modular Fits 22.5" Grills: Patio, Lawn & Garden@@AMEPARAM@@http://ecx.images-amazon.com/images/I/51IhNzBkTML.@@AMEPARAM@@51IhNzBkTML