what kind of car is all this going in? Do you have Pictures of any of this? I seen you had pics of a scion xb i think it was, is this your car? Is this how you want to put the 10inch in?
You need explain a bit more so that we can try and give you advise. Also you need to SEARCH this forum, believe me you. What your looking for is on this site, you just need to spend time LOOKING FOR IT ALL. You can ask any question but most of the time your questions have already been answered, and lot of us don't and won't spoon feed you. Thats just an FYI.
But back to your question, you have to make better sense of it all, sounds like to me you want to put in a 10inch lcd and your not sure how to install the single din radio and dvd. Start with pictures of your car, and describe your questions much better. This may help you out in the long run!