My tcsh configs have been growing for years. There's probably still a few lines in there from my first .tcshrc config 15+ years ago. It's an amalgamation of years of collecting little snippets from here there and everywhere, as well as plenty of my own additions.
I cleaned it up a bit and made it somewhat presentable sharing with others. It's a modular configuration that allows dropping in chunks of config very easily as well as a crude distribution mechanism to copy it to lots of destinations.
Despite how modular it is and the fact that it's sourcing lots of files, it's actually quite fast so there's no delay opening a shell using this config.