Howdy Houngan,
I built a couple of IV kits 10 years ago. It's likely the same kit, although ten years - you never know. They both had the "Siminoff style" dowel joint shown in your pic. They both resisted going all the way down for a tight fit to the top. I did a better job on the second one
. At least to some degree, that fit will determine the string height above the top at the bridge, and consequently the downward pressure on the top from the strings. The goldilocks number at the time(in my somewhat casual reading) was 3/4" or just slightly over(strings above top). So, just be aware of that. To improve the fit, I recommend choosing either the tenon OR the mortise, and work both sides so as to keep the neck centered to the body. If you screw up and go too far(I did), you have to shim to get back to a close fit. Both mandos worked out fine, I play one or the other almost every day. They're also great when you want to try something out - like: I wonder if it really would sound better if I sanded the back thinner? or maybe I should take the back off and carve those tone bars down?
My original finish was aniline dye(alcohol), couple thin coats of shellac, then 6 or 8 coats of tru-oil. I thought they both looked pretty good at the time, however, both instruments have been remodeled more than once and are currently "awaiting refinishing."
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