Theuns, I found these link of interest. You're going to have fun deciphering all this information. Even the cross styles come into question.
http://www.theaerodrome.com/forum/showthread.php?t=40885
http://www.theaerodrome.com/forum/showthread.php?t=57572
Only DR.1 serial no. 477/17 came close to being all red, albeit with white edges to the crosses (with curved sides). 425/17 had a white rudder and outlines to the straight-sided cross introduced during March-April 1918. It was in this aircraft that he was shot down.
View attachment 108225
And I have this pictorial of the DR.1 Manfred von Richtofen was known to have flown:
View attachment 108224
And on this blog page by someone who has visited the Omaka Museum in NZ, an original piece of the DR1 cut from Richotofen's DR1 after he was shot down http://simmsydos.blogspot.co.nz/2013/12/new-zealand-nov-2013-omaka-aviaton.html
http://www.omaka.org.nz/exhibits.htm