Good luck with the venture. I'm presuming you're going for a fairly limited scale of production (as I do with all but the No32 brackets), for the restoration market. The scarcity of Model 1918 scopes limits sales much beyond that, unless there is a similar scope that looks the part for people wanting to build a replica. In fact (just thinking aloud here) but the Mod '18 is a plagiarised Hensoldt Light, so I wonder if they would work? Don't know off hand if the tube diameter is the same or just close, though......