Might not look just like this, but this might be pretty close. TC challenged me to describe it. Ideal being ideal, remember this is something to shoot for. It also happens to be what I see consistently modeled in the NT, from John the Baptist and Jesus to Timothy and Titus. The first aspect you might want to notice, which people tend to leave out of their church models, is the passage of TIME. Life is not static. Anyway...
Pick a town in the world. Any culture. Two or more gifted believers, called and sent by God, gather a group of believers and train them to function as the church.
Over a period of perhaps 1 to 8 years, the planters teach brothers and sisters how to provide ALL the needs of the body. At the same time, these instigators are working for the day when they will no longer be there. The instigators must gradually decrease so that Christ in the body may increase.
In the initial phases, different members of the group will naturally and gradually begin to display certain aptitudes, including teaching and oversight. With the workers' help, the body will learn to recognize, appreciate and share these gifts for the good of the church. However, the most gifted individuals do not necessarily become overseers/elders/shepherds. Also, as the o/e/s's gain experience, they do not necessarily "lead" more often than anyone else. Elders are not necessarily teachers and teachers are not necessarily leaders. The body learns how to provide for its own needs, and everyone's contribution is considered a part of God's building-up process.
The elders, in a way, eventually become the most necessary, but also the least visibly active. These "supervisors" are servants, like everyone else, offering their giftedness when called upon moreso than at their own discretion. A chief role of the church workers (planters, trainers) is to coach the group into interdependency. Settling into ruts will be avoided by openness to fresh suggestions. We are not here to be comfortable. We are here to challenge each other to love and to good works in Him.
Meeting styles will vary. Everyone is free to suggest and provide direction for group activities, including meetings. The body decides, with patient oversight, what activities to pursue more often than others, but reserves times for other ways of gathering as well. Trial and error ensues, but some reliable standards emerge. All the while, learning continues. Our main goal is not to set things in stone that will stand for a thousand years like Solomon's Temple. The Lord's house on Earth is a Tent that can Move! (That's what he said to Moses, anyway.)
Remember, during these years, the original workers are still with the group, guiding, directing and training... but also pulling back as appropriate, and as possible. After the training wheels are completely off, the 'apostles' continue meeting with the church for a year or so, without functioning in any leadership or decision making capacities whatsoever. Their passive presence encourages the church to shed its last vestige of 'adolescence'. The 'apostles' themselves might rest during this phasing-out period or they might use the time to plan and prepare their next 'mission' field (not too close to this one). In this final year, the planters also keep a sharper eye than ever on the church, which finally stands on the verge of being left alone.
In years to come, after the planters depart, the church has two (or more) outside resources to call upon who can visit, provide long distance encouragement. A young adult leaving home still needs help from "mom and dad", but not so often and not so much. On occasion, the church planters might return if the church and its elders are stymied by some difficult matter. An outside perspective can be helpful, especially if the 'apostles' aren't compromised by salary, because - I forgot to mention - they've been supporting themselves with careers all this time!
The brothers and sisters have learned how to keep one another fixed on Jesus Christ, and to lean on, wait on, and stand in Him during all seasons of life. This is what they've been trained for. They have top-down oversight, bottom-up leadership, they've been trained to listen for God's voice to potentially come from any member of Christ's body, and they still have recourse to their founders, when necessary.
That, in a nutshell, is my ideal church. That's what I see in Ephesians 4.
On top of that, if I could really daydream for a minute, everyone in the church ought to be less than 3 minutes from each others' houses by car, if not bike, if not foot. Ancient cities were less than one mile square, and urban sprawl is incredibly recent, historically speaking.
Remember, Ideal being Ideal... we should take what we can get. But I think this is what we should shoot for. Scratch that. Work towards and prepare for. Most of us aren't ready to go for it yet, but I believe we can get there.