Now I finished the interior to the point that it can be painted, before the two halves of the frame will be glued together. I used an Aber PE upper hull set, and also replaced the engine cover with brass parts. All other parts are from Aber PE sets, and some like the seats or the gearing are completely scratch built:
The stains on the brass parts are from the flux I use for soldering. Looks not very nice, but the surface will be totally even and clean when finally painted.