I think its tough to improve on that iconic shape visually, kind of like the strat, its so nearly perfect already. The Retrovibe is one the few basses inspired by the Ric body that really succeeded IMO. Ron's bass is effectively a 4001s, already arguably an improvement ergonomically over the bound 4001, and he's totally owned it, mistakes and all. For me, its an opportunity to learn a whole range of luthiery skills re-creating a bass I once owned. The "labor of love" aspect keeps me going. I'm making a few changes I feel are technical improvements, such as DA trussrod, carbon stiffeners, minimized rout depth at the neck pup, etc. I don't see how its any different than an art student copying old masters drawings to learn technique. There is a small Ric partisan fringe that hates seeing "their" bass copied by one-off builders, they are entitled to their opinion, its no concern of mine. After I have a couple tribute builds under my belt, I hope to branch out into original designs. Mapleglo's Ric influenced builds are a perfect example of a progression from a faithful copy to increasingly original design as she has mastered basic techniques. Her headstock design is what id consider an aesthetic improvement over the original.