A GOSM 3005C charcoal smoker would look nice next to your gasser, sort of a "little brother". Check my avatar.
The 3005C does not need any mods and does a fine job smoking as it comes out of the box. Line the fire pan and water pan with HD aluminum foil.
If you want to do something to help it a bit buy a loaf pan (NOT one with any type non-stick coating), punch a few holes in the sides for air circulation, and use it for your smoking wood. Use chunks, not chips, don't soak them. You might also go with a larger water pan, a round Brinkmann replacement pan might work.
You can not go wrong with a Brinkmann ECB, if that is your choice. Lotta smoker for a little money.