Just use the track. It's easy to get straight, you'll have hardware in as many studs as you want, and you can cut it to length. It's not very picky stuff.
Hanging the cabinets becomes an idiot-proof one-man job if you are allowed to pick up heavy/bulky objects.
You can even slide fully loaded cabinets about if you want, or fix them in place. It all slides more easily than you might think, and if you need to adjust or replace something later it's simple.
One of the often unnoticed benefits is the slight space behind the cabinets and between the track sections. You can put stuff back there, or at least run cables.
I've used some smaller sections of track to fill in the spaces at ends, or cut two larger sections and ended up with leftovers. So long as you keep your sense about you, and watch your studs, it's possible to adjust for annoying spans without any trouble.
These things don't have to be perfect, and that's part of the charm. Fast, easy, and only as permanent as you want it. It ain't light duty stuff, either. You can load those things.