"Any services (must be free of charge) or requests"
Builders should expect to work for free. PMC terms of service requires that all project requests be free. And the last time I paid someone for their building services it turned out to be a ripoff.
The spawn for the hub world is the main project currently. Its what people would first see when they join the server, so it needs to be good.
As far as other projects go, I will need smaller spawns for other worlds, but those are lower on the priority ladder. Also, other builds may come to mind as the server comes closer to when it could actually open.