At one time, there was a company that made a sort of portable awning for the MPG. Sorry that I don't have details on that.
As for adding a window on the front, since the front is radiused, it could be a bit tricky and to do so, you would need to remove the inner skin to build some structure around what would be the window cut-out. I'm sure it could be done - just be realistic in terms of what you're in for.
I did an MPG sub-forum search for "awning" and it returned the following thread matches.
I think you will just have to find someone that does RV rebuilds and talk to them about it. I think the window would be the most difficult thing to do, but for the right amount, there is no limit to what you can do with your rig.