Roman Seissler aka morewings did a series of DR.1s; according to
Arbeitskreis Geschichte des Kartonmodellbaus (AGK) e.V. - 18 Modellbaubogen vom Verlag sero-papermodels also the 103/17 which was flown by Werner Voss.
Roman died back in 2020 and I don't know if someone did take over his business, which was to be found on
www.sero-papermodels.com . I much rather assume that the business was discontinued and the models are no more available for purchase.