actually the base platform is called 253FMM which is a Honda patent, what chinese (and malaysian, indonsein, twn, koreans) did what ehy did to CD70 platform (china replica is 78cc) and that is alter it a bit to escape any legal proceedings from Honda it self.. where as orignal CB/CM/CMX/CA 250 are 233cc the replicaas are 244cc and also changes the over all round corners of engine block and side covers..
there is a chinese company han told me about, who has a sirt bike called Pioneer XF250 it has an Identical CB250/Rebel engine with every thing and bits same to original Honda..
35k seems very reasonable, In lahore 45k is the least price for NightHawk engine we found so far with complete kit (remember the kit is more important then engine which includes CDI, Ignition Coils, Carb, Silencers Bends, some times even Wiring and rectifier too) ... and chinese replicas (Good ones) are hardly found for 40~38k we are string to get hands on one.. if it happens will share it soon ...