I guess you could call my ceiling "alternative"...at least for a bus it was. Now I still had the original ceiling in there, but you could do this attaching to the ribs that run across the tops... I used direct mount drop ceiling.
I got all this at Lowes, the first image is the starter strips, I ran the two of them up the bus 1 foot from the center on each side....
Once the strips are in place, you put in the tiles, and snap the "Tee" pieces in place to hold it up there... I had to add a small piece of starter strip on a wood block in the middle of the ceiling to make the Cross Tee pieces hold...
Along the sides where the cabinets are, I used simple "L" pieces...
I also wanted to keep the coach interior lights, so I removed them from their mounting spots, and relocated them so that they dropped down even with the ceiling tiles...
I started in back and just kept working my way forward...
Since the ceiling curved but the tiles would not, I just let them follow along at what ever angle they had to go in order to follow the curve of the bus ceiling...
From the front looking aft...
And from the back looking forward...
Trim pieces along the edges simply went in like this...
I had to keep the data plates above the drivers seat so that they had access, so I built a flip-up door for that...
Lastly, those ugly half round electrical runs, I just covered them up with white paneling like this...
The finished product...