My first portable project. I've been working on this for a year, on and off, probably just short of a month of solid work as a tentative estimate.
I also used the rubber screwhole covers above the screen, but forgot to put them in until I made the video.
5100 mAH Li-Poly Battery pack - Almost 3.5 hours of life
Unmodded 5" PSone screen
DS Lite speakers
Headphone/AV out ports (with screen kill switch for TV use)
Full N64 controls (even though I broke the Dpad down connection)
External controller port with switch: internal and external as P1/P2, or external as P1
The host case was a GBA carrying case. Donor controllers include 3rd party Yobo N64, 1st party N64, 1st party GCN, 1st party PS1. I used a two part epoxy-like plastic bonder for case construction, it works wonderfully and is easy to use. The case didn't turn out as smooth as I would have liked in some parts, but I got kind of impatient near the end.
I learned a lot from this project and from reading about all the other projects on this site. It's been real fun.
R.I.P. My first two N64s and PSOne screen.