Btw, you are in the wrong section, handheld is for gameboys and things that are already handhelds, you should be in the Wii section.
Something like this one would be more efficient, smaller, and higher quality than the wii2hdmi
Size: 25.15mm x 34.15mm Supply Voltage: 5V Video Input: RGBHS or YPbPr Audio Input: Analog or SPDIF Audio Video Output: HDMI™Latency: Less than 1ms This tiny, power-packed module takes in a VGA or Component signal (depending on the version) and outputs an HDMI™ signal with an embedded analog...
electron-shepherd.com
And here is the wii trimming guide that has a section for the video and audio pinout, where you can find which pins to hook into to get component or vga out (vga only if you have softmoded the wii first with the rvl loader)
If you want to use the wii2hdmi, then you can look up those xbox guides to see where you are supposed to wire the component signal on the pcb, combined with the wii guide for where to get the component signal from the wii
I also agree that using a standard wii with only modifying the video out would be a bad idea for a handheld, one thing is size and weight, the other is power consumption, removing the onboard power delivery and using the RVL-PMS and RVL-PD instead will give you far better battery life and management.
The RVL Power Management System Version 2 is the ubiquitous power solution for your next Wii portable. This compact board handles all your power needs by combining battery management and voltage regulation onto a single board. Version 2 integrates all the features of the original RVL-PMS, and...
4layertech.com
(look at the other product on 4layer tech for things like the gc+ for a gamecube controller pcb and the u-amp for audio if you want onboard speakers and mini jack switching)
Following the trimming guide
BitBuilt modding community how to guides, part information, and tool recommendations.
manual.bitbuilt.net
or the g-boy guide
BitBuilt modding community how to guides, part information, and tool recommendations.
manual.bitbuilt.net
can give you some more confidence in making a more proper portable. Along with looking at the various build logs to see what others are doing.
And don't chop up your main wii, you can get relatively cheap wiis from your local craigslist or similar, or from ebay, just make sure you get a 4 layer one for better power consumption and to better follow the guides.
Just take things slow and carefully, with testing things along the way, like testing how to use a Dremel on something insignificant before you start cutting the wii.
Then you can get a far better handheld and learn a lot along the way
