[pvanroy]

First off: many thanks for posting that Bauzustand for the Guyancourt 109 H - I had not seen that before!

Just a couple of thoughts:

- You indicate that the regular pressurized canopy was later replaced by an Erla Haube. On what information is this based? A pressurized version of the Erla Haube was developed, and prototyped, but I have never seen it installed on an actual airframe. If it was installed on the 109 H that would be really interesting.
- Since the aircraft was pressurized, there should be a small intake on the right side of the cowling for the compressor of the pressurization system (as on a regular G-5). As an aside, I have never seen images of an AS cowling with an intake for the cabin pressurization compressor.
- Since the machine was constructed on the basis of a standard G-5 converted to AS, it seems likely that it used the regular AS cowling. However, for the 109 H, a more refined cowling was planned, which ultimately saw use on the Erla produced G-10. So, it cannot be excluded entirely that the Guyancourt machine may have had the refined cowling.
- The Bauzustand report states that the radiators were positioned in the wing extension "as in the 109 H V55". According to some interpretations, the H V55 had the radiators incorporated into the leading edge of the wing extension.
- The Restabdeckungen for the main gear may not have been entirely like those of the K. Messerschmitt also designed Restabdeckungen for the G, but these were not introduced widely, although some individual machines were equipped with them (e.g. Graf's G-6). The Restabdeckungen for the G were metal, whereas those of the K were wood. Also, in the G they were actuated hydraulically, whereas in the K it was through a pulley system connected to the main gear retraction system. However, this would not really be visible in your drawings.
- Your side views show the aircraft with a regular 109 G wing (no extended tip, slats, ailerons or flaps).
- Two of the links in your post both lead to the same Bauzustand report.

Just my 2 cents!