Nice fresh designed low-boy! I like it!
Nice lines, and the overall shape is easy to look at.
Though I have a few criticisms: I wish it had marquee of some kind. You could add a plexi marquee to the back-top edge, similar to Japanese Cabinets, and put a 'flyer' or Instruction/Pop-up Art in between 2 plexi's pieces. Would really finish it off nicely IMO.
Jaleco Pony Mark IVI would have scaled the foot-base art a little higher, filling up that space a bit more. All the way up to the coin doors. On the same lines of art placement the side art could be positioned a bit higher as well. Guessing those side buttons are for pinball games? Not sure if they're necessary really, giving the width of your cabinet.
Don't get me wrong, I really do like the look of this lowboy, but like harvey said, there's just a few choices I would have done differently as well.
One thing I noticed right away was that you don't have much ventilation in there. I guess using an LCD cuts down on the heat, but with the computer + screen running in a fairly enclosed space, I'd be worried about heat buildup.
One more criticism, with the shape and well executed inspired/homepage design, this thing is begging for a nice CRT. Personal preference I guess.
Anyway take this all with a grain of salt, I still think your cab turned out great. Post some build pics!