I have a quick story that is on topic if you will indulge me. Just so you know I was very good friends w/the late, great Bert Schrager and this is about his cue designs that were copied and passed off as the other cuemaker's design.
The other cuemaker created a cue that used the forearm design off of a cue in Bert's catalog, and the buttsleeve from another cue from the same catalog. There was a big cue show that Bert was unable to attend so this cuemaker decided to pull it out and it won best of show. Bert knew nothing of this.
How Bert found out about it was because this other cuemaker took out a full page ad in the Billiard News thanking everyone for selecting "his" design as best of show. Lou Butera saw this and called Bert asking him "isn't this your cue"? Bert was furious and ended up leaving the ACA because they wouldn't do anything about this, blah, blah, blah.
My feeling after hearing plenty about this from Bert, was if the other cuemaker would have simply said the design was inspired by Bert Schrager and Bert got his recognition and due, he would not have been so angry and all would have been fine.
My point is that the cue world is a small one and the customer drives the market so there may be requests to build something similar. "Borrowing" cue designs is going to happen, but they should never be pawned off as their original ideas, inspired by is the way to go and pay tribute to the original. Treating your fellow cuemakers w/respect is the way to go.
This is a sensitive subject and in a perfect world each would be the creative force behind their own designs, but even the great artists paint the same fruit, or fields, or portraits, they just don't do it exactly the same way (most of the time).
Dave