The cost so far (I priced it up initially at about £80) is at £135!! But then I've gone with a few nice to have bits like an analogue stick, Gameboy Zero screen surround, a safe shutdown pcb and went with an adafruit powerboost instead of the cheaper banggood version.
Bold text I'm still waiting for.
Shell £5.93
Buttons + silicon pads £8.80
LB/RB/emergency shutdown buttons £1.88
3.5" LCD Screen £12.40
Volume wheel £0.99
Power board £17.98
Battery £7.99
Power switch £0.76
Headphone socket £0.00
Control pad PCB £37.80
3D printed Button wells and bracket £0.00
JST connectors £1.98
Micro USB breakout board £0.00
Raspberry pi zero £8.99
SD card £0.00
Speaker £2.99
Safe shutdown PCB £10.00
DS lite GBA Card reader £1.92
Power strips £1.83
Heat shrink £2.00
screen surround + label £8.75
PSP 1000 Analogue stick £0.89
USB wireless adaptor £0.00
Low battery indicator £2.33
I got the case today so wanted to get started. I'm going for a yellow and black scheme. I initially wanted something unique as everyone seem to be doing the standard grey but I noticed Mischeif's GBZ build. Oh well, I might change the button colour yet. I also can't find black start/select buttons without having to pay extortionate shipping costs, I UK based if anyone can help?
Some photos from todays modding. Sorry for the crappy camera, would you believe it's a nexus 5x?
Screen modded to work of 5V.
Dremel skills - screen cut, battery compartment cut, rear buttons.
Filing skills
I'm not to fussed about under the battery cover that's why it didn't get a good filing, it's had a once over but it won't be seen.
Did someone say dremel skills? Definitely not a showstopper but it's bugging me already.
Power port extended for a micro USB connector.
Micro USB breakout board dremelled to fit in place. I'm using a piece of rubber to prop it up which works well as the usb port clicks into place.
Other side of the case, external usb connector.
I wasn't happy with the 2mm gap it left so created a small shim from one of the ribs in the battery compartment.
Hardly noticable in the photos but I could see daylight through the gap so it got filled.
So in all I haven't got very far. I can't drill the holes for the extra 2 buttons until I get my controller PCB that I managed to order on this latest preorder.
I've prepped all the bits I have in my possession with wires so it should be just a case of soldering it all together and gluing everything in.
but now I'm doing another one and making with new custum parts and a few added bits similar to you with psp stick. Mines going to be green with a carbon print lol 
