I like where your head is at on this, but unless I'm missing something you've now got a geometry problem on the short wing side.
Angling the front baffle in the direction you have puts the long wing in the right spot in terms of angle compared to the reference design. The problem this creates is that you have actually angled the short wing IN ten degrees instead of OUT ten degrees by squaring it off.
Danny posted above that you can do whatever you want on the inside (which it looks like you've put a ten degree angle on the short wing on the inside to match the reference design), but again your problem is on the outside (the side that matters).
One maybe easy solution would be (because the short wing is so short) just send the base shape out that ten degrees only as far back as the short wing goes, then chop the base square to the back the rest of the way. You'd still end up with a more rectangular base that should fit better on a stand (or arguably look better on an OB woofer section that is rectangular rather than trapezoidal in shape). Sure, your front baffle will inherently has some toe-in, but the rest of the box will look relatively 'normal'.