The Birch ceiling panel is up and the window is cut out. Now to glue each spar. Note: there are tempory spars pressure fitted to provide pressure on the birch panel to the wall spar on the other side currently being glued.
This next image should help to expain my process.
A - A small piece of wire is pressed between the wall and the panel on each side to help to locate the spar from the inside and to place the temporary pressure fitted spars.
B - Shows an extra bit of pressure using a clamp to hold down the spar that is being glued.
C - Is another view of the three temp spars that are applying pressure to the single spar being glued. Each spar all the way up will be glued this way and each one is allowed to dry over night.
D - This shows a sample of the plastic welt that I will use to create a nice finish to the ceiling panel. Note the scratches, these will be sanded out as they are caused by the tempory spars and they're on a single coat of spar urethane. Once sanded and another coat is applied, the scratches will be invisible.
A slow process but when finished there will be no nails or staples to fill. I will also coat front and back with a single coat of urethane to protect from moisture and warping.

Best Regards!
CP