I love that you've done this and shown us how easy the overall piece would be to modify if we were so inclined.
I'm definitely gonna pull mine apart to cut an opening in the footwell at the very least now.
As far as repainting goes, I'm seriously leaning towards going all 'Returns' on this bad boy with a silver basecoat, second layer with Tamiya 'Smoke' and topping it off with a high-gloss black.
Saw this technique used on a Batmobile kit in a Japanese hobby magazine back in '89, before they went glossy on the actual Batmobile for 'Returns', and the effect was stunning. The black had an almost mirror-like quality to it.
Thanks man, I'm looking forward to seeing what you do with the paint. I'm going to save that for last after I test out the look on some other scrap plastic.
I just finished the first mod of cutting the front wall of the cockpit area and DX09 Batman fits in there
a lot more easily now.
First, I marked off in pencil then line where I planned to cut.
Then I cut it with the Dremel and smoothed it down as much as I could with the different sandpaper/stone heads for the tool. Then I test fitted Batman in there with boots on. His left boot was still getting obstructed by a raised screw eye (which was no longer necessary since it connected the base of the cockpit to an area I just cut off) so I cut that off too. Note the screw hole by the left boot.
With a large chunk of the front wall (and some of the top) cut off, Batman is finally free to stretch his legs. Now you can see his ears completely clear where the canopy would close, and the top of his head easily lines up with the top of the headrest. The best part? His legs are
completely straight, and there's no more trying to work around the tight steering wheel area to bend him at the knees to force him to fit.
Notice how slight the overall bending of the entire figure's body is, he's in more of a reclining position than sitting straight up at 90 degrees, and it still looks natural. Now there is minimal bending, bunching or stretching of the rubber suit, compared to what was necessary before to get him to fit even with the boots and cape off.
Here's a shot of him in the seat with the cockpit re-set into the chassis frame.
And here's another angle. Notice I have him seated
even deeper than before. There's still plenty of room before the front wheel wells.
Now that's all well and good while you have the car dissambled and you have access to his legs to pull them straight through. But what about once it is all put back together? To quote BTAS Robin:
"No problemo, Batman." The figure slides in and out of the driver's seat very easily now...even wearing his boots
and the thick stock cape.
Here's an overhead shot with flash on to show the straight knees and legs clearing the steering wheel.
Just how low can you get Batman to sit in the car once this mod is done?
Pretty damn low.
Look, finally accurate Keaton proportions! 
Some notes to anyone attempting this mod:
1. Be very careful with the Dremel. Mark off where you want to cut and try to stick to the plan. I cut a little more off than I marked but I did that on purpose (and
very carefully) to give it the max leg room that I think it needs. There's no take-backs/ do-overs with the Dremel.
2. Continuing on that point, you'll notice that I didn't add any more leg room for the passenger. That's because the dash LED board is in the way and I didn't have plan to cut and mount it somewhere else. Be extra,
extra careful while you've got that fast spinning blade that cuts through plastic like a hot knife through butter when you cut off the side closest to the LED board.
3. On the topic of the LEDs, once you've unscrewed the main body shell from the chassis,
don't just yank it off. All of the LED wires for the headlights, taillights, afterburner and dash are still connected, so you've got to carefully undo the connections before separating the parts. The HT instructions show you which panels to unscrew to access the headlights and taillights. You don't have to unscrew the headlight access panels to separate the chassis from the body shell, but you
MUST remove the taillight panels.
4. Lastly, I recommend you remove the canopy, gun covers and the shin breaker panels before you start since that makes for fewer parts that can fall off while you have it on its side and turned over (on something soft and thick to prevent scratching, like a duvet). Take the trunk off too so you can easily access the on/off switch to test all the LED connections before you screw it back together. Keep your screws organized in a safe place!
Do this mod at your own risk.
Thanks for the tutorial.
more pics to follow with the complete set up...
Alot of people have already messaged me about how i'm going to have it displayed cos they forgot to read my description of the base a few pages back. The baymobile is gonna be sitting on a motorized rotating turntable which will sit on the centre of the bat logo of the base thus enabling all who see it to admire the beauty of this fantastic collectible from every angle! Stay tuned pal 
Cant wait for your display mate, sounds awesome! Will it be one of those Ikea tables that i've seen other people convert into dislays? That'll be nice but intrigued to hear what different things you have in mind 
