Okay, these are just some general techniques I like to use to build some suspense, energy and anticipation.
1) Repetition. Pick one or more elements of your track and slice them into halves, quarters, eighths, etc. Sequence a line for your instruments that hints what's to come next, play it in smaller then shorten it, then shorten it again and again until you reach the "drop".
2) Filters. Low pass and high pass filters are most frequently used, but don't restrict yourself to just these. Usually the beginning of the breakdown is low passed (so that only bass frequencies are being let through) to slow the track down and lower the energy. The low pass opens up gradually (increasing energy) before a high pass starts sweeping up the frequency spectrum as we approach the "drop". Sometime the high pass sweeps back down to let through all the bass frequencies again and gives the listener the feeling of being dropped.
3) Sound effects. Reversed samples, white noise sweeps, pitch bending, etc. You get the idea. Pretty much every track has a rising effect that leads us up to the chorus.
4) Reverb and delay. Sometimes automating the wet setting of reverb and delay plug-ins (to increase while approaching the "drop") can give a feeling of insecurity and instability, like the track is about to fall apart. Then slamming the wet levels back down to '0' as we hit the chorus, gives the feeling that the track has recollected itself. I'm not sure if I'm explaining this too well, just try it out. Have a listen to some other tracks to see this in action.
5) (Not build-up/drop specific) Sidechain compression. Try sidechaining your main kick and snare to all of your instruments. DO NOT buss all your channels together and sidechain the buss, that won't work. Generally sounds that sit in the higher frequency ranges require less compression than the bass frequencies. This will help your kick and snare punch through and avoid frequency clashes between your drums and other instruments. Hence you can increase the loudness of your track. It also makes your kick sound "heavier" if done correctly, which is MASSIVE in dubstep.
That's all I can think of at the moment. Now onto your track...
(I know this is just the project skeleton, but I'm commenting on what I hear)
I think you could use a few more layers to thicken up your track and make it sound a bit more interesting. Pretty much like everyone has said, try using pads and cymbals to add a bit more depth to your track (a hi-hat playing a constant off-beat hit is not what I mean by "cymbals"). Don't overdo it though. More is less. It's how you use them that really matters. It's no good looping a pattern of pads and cymbals throughout the whole track because it doesn't really dictate any change in energy. Bring them in when you want things to "heat up" and sound fuller.
Your track seems to start in a 4/4 time signature, but when it reaches the chorus it changes to 3/4. I'm not sure if this was purposeful, but atleast 99% of all dubstep tracks are made (and kept) in 4/4 time sig. I'm not saying "don't" use a 3/4 time sig, I encourage you to experiment in other time sigs, but just a thing I noticed.
I'd suggest doing some research into melody, harmony (how the two work and how to use them) and counterpoints. Knowing how to create these will help to give your track some some more life and emotion.
Your track needs more variation. I'm hearing the same tune being looped for 2 minutes. Make it more interesting for us!

A couple of major 3rd switch ups can make a huge difference, but get old very easily.
You snare sounds like its stereo separated. Slam that sucker into mono. On a mono sound system, the phases from the left and right channel will destroy each other and make your snare sound weak. Also, just a side tip, keep your bass freqs in mono for the same reason.
Can't really add much more. Once again, I'm just commenting on what I'm hearing, I know you're still adding stuff to it, but...yeah. I'm liking the track's theme, alot. Sounds very evil and menacing. The chorus is well structured (excellent for a first go) and flows nicely despite being a tad "glitchy/jumbled". Awesome work, can't to hear what you come up with for the rest!
Hope it helps!
Just re-read the OP. Sorry, I do go way off-topic in some areas. Just ignore them
