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*edit for those who aren't aware. i did not work on this constantly for the 2+ years. it sat in storage for well over 1 year of that time. probably closer to 1.5 years. the remainder of it i worked on and off on it. all in all, this probably took me a max of 6 months to do. and that was only due to coming across many issues, like not measuring properly.

ok, guys. it's finally done.

specs:
system - retroduo (both nes & snes sides)
batteries - 2 3.7v li-ion 4250 mAh (i've not had time to test battery life yet)
case - frankencased zn-40 & retroduo housing
screen - psone screen modded with 6 leds
controller - cut up retroduo controller
random tidbits - snes led changed from red to pink; case has custom made decals; uses a switching regulator to get the 5v more effectively for system; both cart slots are parallel with the case

if you are interested, here is the build thread and the link to all the pics i took.

a few measurements of the system:

weight of system - 2 lbs 2.4 ounces
weight of system with both games - 2 lbs 9.6 ounces
thickness - 2 5/8"
height with just nes game - 5 7/8"
height with the snes game - 7"

yes, it is a bit large and a bit hefty. but, it's mine and it's done and it looks nice.

and a few inside pics just for you lot!