The graphic for the winlines are dynamically generated Line renderers using the center positions of symbol transforms. I would like to implement the symbol strip as an option as well though. It's is a bit unconventional as far as terrestrial based real money slots go, but it allows much more user-friendly tweaking of the RTP without having the burden of changing symbol strips explicitly. This was by design, as the current system works solely on relative frequencies of symbol appearances. Nope, there is currently no way to define reel strips symbol-by-symbol.
