We just released another Unbesiegt design last week, this time based on the BMW 2002. These cars (along with the CSs/CSLs) began BMWs domination of the European Touring Car Championship (ETCC), which ran the whole way up through the early 90s and the M3. The beginning of a fairly successful history in sportscar racing, by most people's standards.
There's something about those old European racecars, usually being driven at 10/10ths by lunatics who had little regard for life or limb, that really captures the imagination. The design is available for purchase in the Shop as we speak, the PreOrder goes through July 4th.