I found that CMM Composites were (surprisingly) the most fun of the construction. I figured that looking for a location on Inara etc would just put me chasing the same scraps as other commanders, so it would be better to find my own sources.
There were dozens of refinery systems within a single jump of my T9 (she has a Titan SCO drive, which is great for range but it means she runs super hot and has a lot engineering to make it all work) so I prioritized large population systems and looked for refinery planetary ports. Mostly I was only getting ~450T CMM Composites at a time so I would keep moving rather than return, always looking for a better port, and whenever the T9 was full, drop them off and continue the search. I eventually found a nice 800+T supply that was 15Ls from arrival, but had nearly finished anyway.
It obviously wasn't as fast as getting eg. Steel, but it was a lot more interesting, and I've got so much better at planetary landings that I'm starting to enjoy them more; less worry more doing what I intended with less effort.
Holy carp, I got so good at gliding until right on top of a settlement that at one point I came out of glide at just ~2.5km altitude, directly above a city that had a ~2km spire and just about hit it from glide! Brown trousers moment!
Each system I went to was also a new opportunity to look for appealing new crew, check the pioneer store for used gear, keep an eye out for a tech broker or material trader, etc.