The other louvres were done with corrugated aluminium left over from an HO model station.
I am not sure if it is still available since I have had it for many years.
There is a plastic version made by Slaters in UK availabe, but it is not as well defined and is thicker. I saw it in a model railway hobby shop yesterday.
I use "Irfanview" (free download) to lower the quality of my photos but I have not yet found a way to reduce the area of the picture.
Peter mentioned another programme further up this topic but I have not tried it yet.
As for the exhaust louvres, I see you have the outside parallel with the mast, which is what I achieved with number 4. If all else fails I will use that one but I am hoping to get the outside of the louvres angled at 45 degrees as per the full size ones. All I have to do is to get the idea I had at 2.00 am last night, to work in daylight.