I am not aware of a tutorial at this point. I can give you a suggestion, though. The first (and only 1 of 2) woodies calls i ever "made", and are still in use, might be considered cheating a bit

lol I went to the pet store, and bought a pack of two squeakers (not the actual toy, but the part that would go into the toy). it has a small reed and a band holding it, surrounded by a small tube. this was inserted into the part the dog squeezes, like a little plastic ballon. Remove that part, and take a 1/2" toneboard with the 1/4" channel, cut in half, then place those halves around the little plastic tube (to hold it into the call). place into an exhaust (with the 1/2" hole) and voila. It might take adjusting the band around the reed a little bit to get the sound you want, but it works those early morning woodies in catahoula lake quite nicely, most of the time lol My uncle actually has a woodie call made similar to the pattern of duck call we make, with a full length single reed, toneboard and all, but it's 200+ miles away so i cant look at it. Even though he uses that with success, i still prefer the ease of the other, works just as well

Stubborn me.
Dan