I just took my Blast to an event and back (and up narrow stairs and through tight door frames), and I can summarise what I've discovered is the easiest way to get it compact enough to transport:
First lift out the monitor. It's by far the heaviest module in the cabinet and you'll need to take it out while there's still structural integrity. Open the control panel with the key and pull the two tabs that stick out through holes left and right of the service buttons and monitor control panel. That loosens the bezel enough that you can pull it off. While you're at it, you might as well take off the control panel entirely as well, it's held with 4 or 6 hex bolts. Unplug all the AMP connectors, including the ones on the monitor frame, and the flat cable that connects the monitor to the monitor adjustment board. Make sure there's no VGA cable connected at the rear of the monitor. Unscrew the four big bolts that hold down the monitor frame, NOT the smaller ones that hold the monitor tube to the frame, and you can lift out the monitor. Get someone to help because it weighs 40kg and the frame has sharp edges.
At the rear, unscrew the power supply by its four outer screws and simply pull it backwards out of the cabinet. Tilt the cabinet forward and unscrew the eight bolts holding the cabinet wheels in place, and remove them. These connect the front and back halves of the cabinet, which we'll leave mostly intact to prevent unnecessary disassembly and reassembly.
Take off the marquee light from the back, leaving the front on. 5 or 6 six screws from the back, and it comes off. I'm sure you're supposed to use a JIS screwdriver, but for me a PH2 worked just fine. The marquee is attached to the cabinet by its power cables (2 pins AC + 1 pin ground), just let them fall down inside the cabinet if they're not held down by cable ties somehow. Lift out the marquee reflector, it's not held down by anything other than gravity.
On the seam holding together the front and back halves there are 4 or 6 screws on each side, unscrew them. The back half should fall backwards into your hands, and you can lean it against a wall, note that it won't stay upright because it's top heavy.
That's it! Now you have a front half that comprises the floor plate, front door, coin box, main front half and marquee glass, and a loose monitor, bezel, control panel, marquee back plate including the marquee light, reflector, power supply, two wheels, and the back half. All of these will fit easily through 75cm door frames and up and down tight stairs.
Hope this helped! Sorry for the lack of pictures, I'm not in the mood for disassembling my cabinet right now.