Looking good!! If the wood is dry and brittle, try making the exhaust bore larger and making your O ring tenon bigger. The O rings in the kit won't fit, I think you have to go up 1/16 in size on the O rings.
I found out several years ago that if you make the call with just 2 pieces and step drill the reed holder and exhaust bore into a single piece you only have 1 tenon and 1 set of O rings to deal with. Drill the exhaust bore 3/4" for at least 4" then center drill with a 1/2" extra long bit for 2". This will give you the 1 piece reed holder and exhaust bore. Then on the mouth piece drill it with 3/4" bit.
Bonnie, in my opinion these calls sound a lot better. If the exhaust tube is at least 4" long the sound is deeper and sounds more like a mature buck. If you make the exhaust bore too short, they make good firewood, you also have to explain to the user that they are not using a horn and that they need to blow softly or it sounds like a muffled machine gun.
Marvin