QUOTE(zemperor @ Aug 20 2013, 09:48 PM)
not online for yesterday and it already so much post and new version...
anyway, congratulation on another new version
so that's how u mod the batteries box... looks like very nice to play lego sets with remote control
wish there will be new sets with remote control at next year...
BTW, already do some little modification to my MKII
here are some pictures:
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first, the gear at LA...
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i remove this parts to make way for the gear:
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not sure will it affect the support of the crane by removing this parts... maybe can substitute with this:
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but unfortunately, this is a bit of 'broken'...
and the outriggers (the 4 supports near the wheels)
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i substitute the blue with my old, loose part, but i don't have enough parts, so i substitute some with beam instead:
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the beam is not long enough to touch the wheels

even when turning around the corner
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There are couple of ways I use to mod rechargeable battery pack:
1) The one you saw, 8x AA, but bulky.
2) 8x AAA, fits into the battery box, but juts out by 0.5cm
3) In plan: mod direct 9v adapter
4) In plan: mod out the board or direct-to-cable 9V (without box)
My comments on your 42009:
* Your gear looks good, but is it me, or the 20T right-gear (next to cab) is a bit slanted or under pressure ? Or you have not push the bottom axle fully-through yet ?
* Can the left-yellow L-beam adjust left-right (and the grey-bush at the back) ? Since you take out the 1x3 Liftarm.
* Since there is no 1x3 thin-liftarm (without axle hole), I think maybe can fit a 1x4 thin-liftarm as replacement ? Not sure will affect operation or not. Otherwise I have extra that can sacrifice to cut it.
* yeah, the axle-pin without friction for the out-riggers looks good. Is it more smooth when motor the outriggers ?
* Time for you to order parts ...
Jealous ... I not yet have time to build this. But I think I will build B-model first. Play a while, then disassemble and build A-model, and keep it as that. Cause once I build A-model, don't think I will build B-model already.
BTW, I found out a rough-way to synchronise the 2x LA. Just extend to maximum and let it grind 1-2 times. In my 8043 last weekend, it auto-sync my LA, since I switch it to parallel 20T gears also.