Why can't you solder anything to your wii's motherboard? There is a lot of guides which explain what to do first when building a portable, where are all the voltages you want to solder to, what vias corresponds to what functionnality on the wii or on the other modules... You can also find information on the 4layertech website in the documents section
At first you'll want to confirm that your trim is working so you'll need to wire up your voltages, u10 either with the 4layertech pms if your using it or with u10 relocation and your video output which is either composite or VGA depending on if you chose to enable VGA patch when installing RVLoader