blah, the forum just ate a really long post I made. Anyway, heres an animation of one of the cabs I made. It goes by quick so here's the run down (in summary because I don't want to type all that up again

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First I squared the base with 2x4s, screwed, glued, and clamped them down.
Then I put the front and back pieces up, made sure they lined up, glued them and screwed them along the bottom. Make sure you countersink your screws, unless you want them exposed.
After the front and back were secured I turned it on its side and put the side piece on, screwing through it and into the side of the front pieces. When screwing into the side of MDF you have to be careful not to get too close to the edge, or it'll kinda rip through it. If you can, get someone to help you move and position the side pieces. I had to do the whole thing alone and it took 3x longer than it should have.
I screwed 2x4s to the inside of the side pieces for the TV tray to slide onto.
The top pieces went together the same way, I made sure they were aligned with the back then clamped a 1x2 for the piece to rest on as I secured it in place. I think I used some L-brackets for extra support but they weren't really necessary.
There are a lot of ways to fit the marquee in. I routed a slot into the top most piece to slide the plexi into, then secured the bottom with a piece of wood wedged between the plexi and an L-bracket. Not the most professional way, but it worked. If you're going for a perfect replica of a moon patrol cab, I can't help you there.
Your control panel is a lot different than mine, looks like you can just screw it in from the sides like the other front pieces.. If the top part of it is metal you might want to consider just making it out of wood, and sanding down the front curve, unless you like bending metal.
One thing I noticed is the bottom of your control panel doesn't overlap over the front piece.. It'd be much easier if it did.
Well thats how I put mine together, hope it helps. If you want, you can give me the dimensions of each piece and I can put them into 3d space and make sure they'll all fit together with no gaps or other surprises.