No, as far as I know, Bill doesn't use dovetails. He uses modified rabbets and other types of joints (like bevels). The cabinets are super strong and the joinery is first-rate. IF you look at my amp thread, you can see that the woodworking doesn't match. The Straub head cab, with woodworking done by Harry Straub, is square-edged and utilized dovetails. The speaker cab, with woodworking done by Bill Boekhoff @ Sultione, has rounded edges and use rabbets and other joints (like the beveled press-fit joints on the removable convertible back slats. Note that, while both pieces were finished concurrently by the same shop, they don't quite match due to the difference in woods.
What you may not be able to see is how much cleaner the joints look on the Sultone piece. The sappelle splintered when Harry cut the dovetails and he had to use wood filler (putty) to try and hide it. The Sultone cab has no such problems. With no disrespect to Harry intended, Harry's forte' is electronics, Bill's is woodworking. Harry's woodworking is good, Bill's is a work of art, IMHO.
REMEMBER: drawers are dovetailed for a specific reason. A dove tail has strength only in one direction, and is weak in all other axes. Note on a drawer that you have in your home which axis the dovetails lie in. Dovetails are strong only in the direction of the drawer pull. Take it out of it tracks and press on the drawer sideways (i.e, perpendicular to the drawer pull direction) and watch what happens...it can easily come apart.
My whole point in this is to recommend that you not get hung-up on specifications. If there's a stronger way to make a box's joints, Bill would be using it. He walks the line between strength and aesthetics, and does so deftly and with precision.
The only negative with Sultone is the wait. I'm waiting over a year for my Twin Cab and counting. If you order, don't make the mistake of paying up-front in full and, by all means, make a pest of yourself, LOL!
Cheers,
Kevin