Terry,
Thanks for the reply.
You wrote, "Sounds like you already have a pretty good collection of books" -- Not a sufficiently large library to preclude my posting here, though!
"They may have stopped outlining the cross whan the edict came down to return to white rudders and Balkenkreuz" -- It's a strange little irritating but elegant detail. One would think it wouldn't have taken very long to complete the cheat line, but perhaps it was meant to be like that? But for what reason.
"There is an early shot of a Jasta B line-up with204/17 from the port side with the bottom wing crosses and no outline of the rudder cross." -- Reference?
"The bottom wings crosses were definitely deleted during a later paint job as seen in a photo in Leaman's book." -- And in other sources too, but those to hand are unclear about whether the overpainting is solid, whether they were scraped off and the streaky finish imitated.
"Tailplane cross looks painted out, but make your own call once you have seen the photo." -- In which image? Imrie calls it still in place at one of the later stages.
"Hard to tell on the red stripe. Most color profiles show the black wingtips were too far inboard for red stripes on top." -- Here's a link to an image showing the tricolor banding on the lower surface of the top wing. It certainly looks like they're all turned up onto the upper surface, no?
http://www.fokkerdr1.com/Dr1-204-17_04.jpg
"The interplane struts are definitely a very dark color in the latest date photo I have seen. Probably black, but could have been red, dark green, etc. Look black to me." -- I'd think black, like the cabane struts.
Signing off,
A-h