Seems like a win to me, as long as you have the space for it.
The extra space lets you go from 8 ball locks on the floor to 9 ball locks on the floor, plus a few 5# CO2 tanks. Add a 1x10 insulation sandwiched or 2x10 collar, and you can add another 2 ball locks on the hump while swapping up to a single 10# CO2 tank.
No matter what you do, keep the number of taps an even number. Start with 4 taps, a dual primary and a 4-way secondary. Drill the four taps in the center of the collar, with the holes 3.5" on center, to leave space for big tap handles some day. Like so.
For now, just stick to the 4 beers on tap. It's a fine art learning to work your keezer. You don't want to get overwhelmed, because then it's no longer fun. Consider the rest of the space room for lagering (which you can do in Cornys, btw), carbinating, or storing your next brews. You'll also have plenty of space to store your yeast, cold crash primaries or starters, and thaw any hops.
Later on, you'll be able to easily add to it. The secondary will be gangable. If you ever decide to move up to a 6-, 8-, or 10-tap system, you could easily add them on either side. The dual primary allows you to force carb, carb up soda, or use a beer gun without having to turn off everything else or touch their pressures.