Just finished a few.
first the pics:



Someone else in another thread pointed out that the center of balance for the bottle needs to be positioned over the base. That was all I had to go on. Here's what I came up with in terms of a plan---you may like the fact that there are no measurements.
1. Get a board that's around 3 inches wide and around a foot long for your blank. Get it surfaced to your liking, and round the edges if you want to do that.
2. Set the table on your drill press to a 40 degree tilt and chuck a 1-1/4 inch Forstner bit. Pick an end to be the top, and drill your hole about 2-3 inches from the top end (which will be the low end while it's on the tilted table). You'll want a disposable backer, I used a 2x4 cutoff.
3. Set your saw up for a 45 degree bevel cut. With a bottle handy, eyeball the distance that will get your bottle's center of balance over the base, and cut somewhat longer.
Make sure the blade tilt is parallel to the hole you drilled! Then test your balance and sneak up on the length that will get you a stable arrangement when you install the bottle.
Repeat as needed. No CAD files necessary.
This walnut cutoff came from the bargain bin at my yard--I paid 45 cents!