You can build a very simple, but effective 3 way, but at a cost. Driver cost & crossover parts cost. Oh yeah, you will need a fairly large enclosure too. And, limit the usable low end to around 40 Hz. The efficiency to around 88 db/watt. It comes down to driver selection and retaining a minimal number of crossover parts. Using natural driver roll offs as much as you can. A wide range mid range is the key. Along with a large enough woofer able to move adequate air that is clean to 2.5 Khz. Sealed box. No traps required on any of the drivers. Maybe one Zobel. Yes, I am teasing but serious. As is usually the case, it comes down to effective, efficient engineering. With all that said, for a beginner to understand all of the issues, choices and work required to pull it all together, it is a major, I mean MAJOR task.
I will post additional info about what I have intimated if anyone is interested. Do not want to give away the farm, but interested in seeing what direction this build will take without my intervention. John