As far as redesigned nose -
My understanding was that there were three OEFFAG types
.53 was same form as Albatros D.II - square wings with two lower spars
.153 same form as Alb D.III - sesquiplane with one lower spar
.253 had the redesigned nose with no spinner, also sesquiplane
Now you have interested in looking at the plywood panel shapes.
Rick