Sorry about the theft, I recently took a look at the thread since it was bumped and I felt terrible, nonetheless here is your chance to come back and better then before.
From my understanding you would like to put the unit in the center of the area you have pictured since you have the a/c controls relocated to the top.
Now for the Double Din completely understand that their is a weight issue.I am assuming that this is a Double Din Unit, right? In that case I would buy a double din kit. Any generic double din kit from any car would work. You would use the brackets to hold the weight of the double din. The only issue I have is that I do not know what the inside of your dash looks like, so I am not quite sure what the actual brackets would attach to.
As for the bezel, that is a great idea. What I would do is make sure you have the double din completely solid in your dash via the brackets, then place the bezel over the DD, then your stock console over that. Tack in the bezel to the dash panel, and pull off the stock panel. This way you will have the perfect placement of the DD's bezel on the dash panel. Then from there you can fill your gaps. You can either use a wood backing and build it up with fiberglass reinforced body filler like Duraglass or "kitty hair", or you can stretch fleece and start glassing to fill the void.
Both methods will work just as well.
I hope this helps to start your build, if you have more questions, just ask and I will be more then happy to get your system back and running through this thread!