Hill billy redneck?? Not enough tools?? Man yore squattin in tall cotton. Got yoself a shop where you can work indoors an all. I gots to clamp my tools down to the picinic table and make my calls out on the patio.
Actually your method is almost identical to mine. I don't drill quite as large of a hole in the mouth piece. When it comes time to drill out the bell end I use a forstner bit to open up the channel to the size I want. On calls that have a flare in the bell I use a Dremel tool with a sanding drum to shape the interior of the bell to match the exterior.
So remember. Boy,, don't you be knocking yoreself none. Dems be some mity fine lookin calls. I gots ta go now. My rich cousin jus got hisself a brand new house and I gots ta go hep him take da wheels off. Dale