Looks very nice however, with all the trees and other vegetation, I wonder what the frame rates are in P3D V4.5?
This depends on your rig. For sure there are lots of objects and animations inside, but especially the trees are no problem. They are done as follows:
In the background, inside the forrest, I use big texture sheets with many trees on it - this doesn't need much preformance. In front of that, I place smaller sheets with less trees and in front of them I use single trees to suggest 3D trees and a big forrest. On the edge of these trees, I place mounts or vegetation lines which completes the illusion of thousands of trees ;-) . Here how to make it in two pics:
This is the shot from the sheets done in Gmax:
And this is the same sheet like it looks inside P3D:
So instead of many trees there are only used 6 crossed sheets for this forrest part
Meanwhile, the final scenery is running fine on my i7 9700k @ 4.9 GHz and a RTX 2070 Super 8 GB with locked 30 frames in most views and using for example high performance aircraft like Just Flight Tornado or MILVIZ F-4E.
Settings most at 75 %, using FSrealWX as real weather addon and UT-Live traffic as well. ORBX Germany North surrounds RAF Brüggen and this is a horrible performance killer.
I am testing Brüggen also on my much older rig which is a i5 2500 @ 3.7 GHz and a GTX 1060 6 GB and I try to reach 20 frames with moderate settings, most set on 50 % with features above.
Both PCs with only one monitor and 2048 x 2048 texture resolution.
Furthermore, it depends on the additional features you are liking like real weather or AI traffic, ORBX addons like Germany North.
P3D settings like Dynamic Lighting or Dynamic Reflections, shadows etc can drop your performance a lot. But with moderate settings RAF Brüggen will be fun to land, approach or just move around